Before we get into more details, here are some higher-level thoughts on the business overall: how will people get to your site and how will you make money from them?

One strategy is to pay for ads. People doing this already are easy to find: search in an incognito window with questions like "college information", "choose college", or "college for me" (be imaginative). Click on the ads that don't look like they're for particular colleges. This drops me on a few landing pages:

• http://www.educationmatch.us/college_finder/
• http://www.noodle.org/colleges
• http://www.educationconnection.com/landingpages/programs-is
• http://www.schoolguides.com/
• https://www.plus-u.com/

You don't know very much about these businesses, but you know they're all making enough money on an ad click for it to be worth it for them to advertise here. (Looking in the AdWords keyword planner suggests they're paying $5-$20 per visitor (CPC).) If one of these sites is doing something that seems weird to you, don't write it off as dumb: they're making money or they wouldn't be able to afford to show up when you did the search. Maybe they have some low-hanging fruit in improving their layout, and they certainly don't all look the same, but if in doubt they probably know something you don't.

It's also possible for people to come to you via searches. Do some searches yourself; see who shows up. This business model is harder to replicate because it's much less clear how they got onto the front page for a search. SEO advice tends to be terrible, and for good reason: it's an adversarial game where success is very lucrative and people are constantly pushing limits to see how scummy/profitable they can get without stepping over the line and getting banned (recent example: rapgenius).

Word of mouth and viral/social are also possible, but even less predictable. But then my bias here is for paying for traffic because I used to work in advertising and it all feels very natural to me. But however people get to your site, you want a good sized flow so you can experiment and test things and see what works. Iterating with no one watching is hard to get to go anywhere. (One nice thing about the non-ads flow is that focusing on making your users happy and have a good experience lines up with your incentives. If you go the ads flow every visitor is to a first approximation someone you'll never see again and so you don't care about their experience just how much money you can get from them. It's like businesses that cater to regulars vs tourists.)

Once people get on your site, how do you get money from them? The simple strategy is to put up ads, like adsense. These pay very little, like $0.01 to $1 per thousand visits. Maybe somewhat higher because you're in a vertical (education) where there are advertisers with a bunch of money to spend (colleges). There's no way you can pay for ads at $5 per click and make your money back at $0.001/visit. So what are those sites like educationmatch doing? They're collecting information from people and selling it to colleges. This is called "lead-gen" advertising. The most obvious form is when you land on a page and it immediately asks you for information about yourself. If you're going to place search ads, you basically have to do lead-gen; nothing else is profitable enough per-visit. (When you start off you'll sell leads to a lead-aggregator who sells them to the colleges. When you get big you negotiate deals directly with the colleges and get a bit more per lead.) If instead you want to make money by putting ads on your pages you need to go with cheaper but higher-volume sources of traffic, like being awesome, getting people to link to you and talk about you, and getting high up on search results pages.

Back to specific design notes:

I do think that the current design satisfices (won't wow, but won't draw people away). Do you?

To actually answer this question you need data from your site and competitors to compare bounce rates. You're not going to get that, so the best you can do is calibrate retrospectively: when you do get a designer and redo your site you should A/B test the redesign so you can see it's impact. This only works if you have enough traffic by then to get meaningful results.

My guess is that the appearance will make some people leave with "this looks unprofessional/fake" but this isn't something I'm good at estimating. You should at least fix the aspect ratio on the main image; I found the vertical squishing very distracting. Cropping it instead of scaling it in the browser would work, as would using only one of height= and width=.

there are some ways in which I think my design is much better than that of my competitors ... unigo.com

unigo looks more professional to me, though still not as polished as something could be. But polish isn't everything; many of the sites I linked to above aren't going to win any design awards. Many of them look kind of tacky and overly slick. They're all making money, though.

I've heard this before, and am not sure what I should do.

Sit down with someone and watch what they do with your site. Then sit down with someone else. Look at your competitors and take the best ideas from many sources, then mock up a new front page design and sit down with another person. Repeat until you run out of fresh victims/friends. You're too small for fully-automated a/b testing, so substitute quality for quantity and watch real users in person.

I'm not sure how to limit by IP

Many colleges have a contiguous IP range. For example, everyone browsing from on-campus at Swarthmore will be 130.58.something.something. Make guesses from looking at the IP of the college webserver, and if various departments that do their own webhosting (cs, math) all are in the same IP range you're probably good. You can also look through your server logs to see the visits from people you know are at certain schools. It's also possible that this can be looked up somewhere.

I feel that being comprehensive is more important than annoying some people with some questions.

It's a balance. Trying to channel "teenage girl" I have the impression that "how hot are the girls" would be something I would find off-putting. But my mental model is pretty bad here, having never been one.

A final note: this all sounds kind of mercenary. My perspective is that's what you have to do if you want to make money in such a tightly competitive market. That's part of why I'm glad I don't work in this industry anymore.