I'm sure I'm not the only one but I've bought a domain registration for $150 and a USB Block Erupter for $900 in today's money !! I could have had a nice new laptop had I not squandered it.
I bought a 2btc bitcoin erupter. No regrets, it's collector. ( also i bought it for 200$ as i changed euro to pay for it and didn't reduce my bitcoin capital)
Still 2000$ makes it a expensive toy ahah, i don't even bother minning with it now!
Also i bought a blade for 5.5btc same idea :p
Or a 10 double beer 0.1 btc a few month back to pay back a friend! i remember i told him that soon it was going to pay of the entire bill. I was wrong, payed it off 5 times now ahah
i'm very happy with all that at the end...