What hobbie have you spent far too much money on?

For me that was Yu-gi-oh! cards when I was younger. All of my spare allowance went to those cards, which was a shame because I was really bad at the game. I bought cards that looked cool, not the ones that were actually good, so it was no surprise I never won a single game with anyone who knows what they are doing.

As a result, I think that the mountain of cards I accumulated might be worth *less* than what I paid for. Maybe a good $700+ dollars I've spent on the game across a few years. That may not be a lot to people with more expensive hobbies, but its certainly too much for me.