Student loans I guess. I could've gone to CUNY ( Brooklyn college) for free. But I wanted the " real campus, real college experience", real diversity, joining organizations etc.
I use to be a heavy Yugioh card player in my earlier 20's. I spent over 5k on cards, Shonen jumps, regionals, and preview tournaments. I could've used that extra cash for something else
Like Vice Queen said, I could've saved more money.