I think being a part of the greek system can be one of the best expirences in your life. of course it is a life long commitment so you should seriously look at your choices and where you fit best. Please don't look at the best parties and girls ( I know several of my friends that did and regretted it)
Also as far as the money issue goes- it goes to formals, philanthropies, community & campus events, date parties, etc etc. which of course aren't free
you'll meet some of your best friends in college and as an alum through your group.