Had a bad period 3 years ago. "Bought" MMR, Hobbit and Predator all in quick succession. Needless to say none actually have turned up. Still hoping to get MMr but I'll never pre-order again
Paid over the odds for an ID4 as one hadn't come onto the market for ages. Then naturally the week after one appeared at half the price and another a few weeks later.
Oh well, this stuff happens. Selling at a loss isn't the end of the world as I still enjoyed playing it.
Only machine I ever really regretted buying was T3. Knew after my first game it simply wasn't for me.