There seem to be perverse incentives in the dating industry. Most obviously: if you successfully create a forever-happy couple, you have lost your customers; but if you make people date many promissingly-looking-yet-disappointing partners, they will keep returning to your site.

Actualy, maybe your customers are completely hypocritical about their goals: maybe "finding a true love" is their official goal, but what they really want is plausible deniability for fucking dozens of attractive strangers while pretending to search for the perfect soulmate. You could create a website which displays the best one or two matches, instead of hundreds of recommendations, and despite having higher success rate for people who try it, most people will probably be unimpressed and give you some bullshit excuses if you ask them.

Also, if people are delusional about their "sexual market value", you probably won't make money by trying to fix their delusions. They will be offended by the types of "ordinary" people you offer them as their best matches, when the competing website offers them Prince Charming (whose real goal is to maximize his number of one night stands) or Princess Charming (who really is a prostitute using the website to find potential clients). They will look at the photos and profiles from your website, and from the competing website, and then decide your website isn't even worth trying. They may also post an offended blog review, and you bet it will be popular on social networks.

So you probably would need to do this as a non-profit philantropic activity.

EDIT: I have an idea about how to remove the perverse incentives, but it requires a lot of trust in users. Make them pay if they have a happy relationship. For example if the website finds you a date, set a regular payment of $5 each month for the next 10 years; if the relationship breaks, cancel the payment. The value of a good relationship is higher than $5 a month, but the total payment of $600 could be enough for the website.