What's the worst Gaming purchase you ever made?

I'm just wondering what are some of the worst gaming purchases you made? Also why?

(I'm trying to decide if some old games & DLC are worth the price or too expensive. It got me wondering where ppl draw the line.)

Edit: Oh wow, this is blowing up. I guess a lot of ppl have felt ripped off by pre-orders, special edition games, & hyped games that were glitchy on release.