People might not like my response, but I'd say that if you're in a situation where you believe something might be beneficial to you but it consumes a substantial portion of your resources, you should heavily lean towards not going. This applies as much to a rationality workshop attended by someone with a tiny budget as it applies to playing the stock market. Making large expenditures for an uncertain return is generally a bad bet even if the expected utility gain is positive, if failure has a very negative consequence. And human beings are notoriously bad at assessing the expected utility in such situations.
You also need to be very confident in your ability to evaluate arguments if you don't want to end up worse than before.
Obviously, this doesn't apply if you're absolutely certain that going gives you more benefit than you forego in money, time, and parental willingness to give in (which may, in fact, be in limited supply) so there is no risk of loss, but not too many people are really that certain.
But surely going to a rationality workshop is the best way to learn to evaluate whether to go to a rationality workshop. And whether it succeeds or not, you can be convinced it was a good idea!
A few notes about the site mechanics
A few notes about the community
If English is not your first language, don't let that make you afraid to post or comment. You can get English help on Discussion- or Main-level posts by sending a PM to one of the following users (use the "send message" link on the upper right of their user page). Either put the text of the post in the PM, or just say that you'd like English help and you'll get a response with an email address.
* Normal_Anomaly
* Randaly
* shokwave
* Barry Cotter
A note for theists: you will find the Less Wrong community to be predominantly atheist, though not completely so, and most of us are genuinely respectful of religious people who keep the usual community norms. It's worth saying that we might think religion is off-topic in some places where you think it's on-topic, so be thoughtful about where and how you start explicitly talking about it; some of us are happy to talk about religion, some of us aren't interested. Bear in mind that many of us really, truly have given full consideration to theistic claims and found them to be false, so starting with the most common arguments is pretty likely just to annoy people. Anyhow, it's absolutely OK to mention that you're religious in your welcome post and to invite a discussion there.
A list of some posts that are pretty awesome
I recommend the major sequences to everybody, but I realize how daunting they look at first. So for purposes of immediate gratification, the following posts are particularly interesting/illuminating/provocative and don't require any previous reading:
More suggestions are welcome! Or just check out the top-rated posts from the history of Less Wrong. Most posts at +50 or more are well worth your time.
Welcome to Less Wrong, and we look forward to hearing from you throughout the site!
Note from orthonormal: MBlume and other contributors wrote the original version of this welcome post, and I've edited it a fair bit. If there's anything I should add or update on this post (especially broken links), please send me a private message—I may not notice a comment on the post. Finally, once this gets past 500 comments, anyone is welcome to copy and edit this intro to start the next welcome thread.