Sometimes I feel like I have too many.
Totally agree with you there.
Guitars & Keyboards & Equipment to go with them: I've pretty much slowed down now, but I'm always on the lookout.
Video and Computer Games: Even given steam sales and humble bundles, I have a backlog that years deep, and have spent way more money that I should have.
EDC: If I'd known when I started how expensive this would get, I'd have just stuck with my keys on a split ring and my simple wallet.
RPGs: I have enough for a store (mostly from when I used to work in one), and still back a lot of Kickstarters for more.
Boardgames: See above.
Computers: I have way more computers than I really need, and still buy more.
Dice, Coins, Tokens, and accessories for rpg/boardgames: Didn't think dice were expensive? They can be. Very expensive. Waiting for a set of wenge dice inlaid with mother of pearl right now.
Bags: I can never find the perfect one to take to work.
I've let go of my extensive DVD collection finally. But now I'm just getting digital. Not expensive singly, but en masse, it's not pretty.
I also finally got rid of my miniature collection- Warhammer 40k and Warmachine.