The thought only just occurred to me... but would Steam purchases count?
I went years without adding any funds to my Steam Wallet, and I kept buying things here and there because the Steam Trading was so profitable, my Steam Wallet kept increasing. But..... then I made a bunch of really sloppy purchasing decisions, which I'm certainly saddened by. Bought a Dota2 Lina Arcana when it was on sale for about half off, expecting to turn a quick buck in a week, only to lose money when it dropped in value as everyone and their mother was liquidating their own to buy OTHER items that went on sale. Purchased a few of those on-sale items to rebound a little, then THEY lost value when they were being liquidated to fund the purchases of other items- also on sale! So now my latest purchase was 2 Dota2 Phantom Assassin Arcana, one from the store for $28, one from the market for $29 which is upgraded, with the hope that THIS TIME will be different and I'll be able to sell one of them for upwards of $29 when the sale ends in 2 days, instead of repeating the same trend and losing more money. ~_~
If Valve makes another random sale and THOSE start losing their value due to mass liquidation.....
Well, at least I really like the Phantom Assassin Arcana. It's damn purty! =D