I don't mind of you call yourself 電影男, only faggots snap about shit like that.
So you litterally HAVE to spend "hundreds of dollars"?
I've never been to a formal but it seems like it could be a memorable experience. Sure, if you don't have good reasons, like a date or accompanying friends, or something else, then I suppose there really is no point but if you DO.
Just saying. It's also kind of biased preaching against formals just because you personally can't find reasons to spend that money.