[DrMitchJ]

I sold my Mike Trout 2009 Bowman Chrome auto to pay for 2012 Topps Chrome case.
Let that sink in.
That was the year when Chrome started to SEVERELY start to suck.

That's the worst. I've done that several times. The old "well, I could use the money I have OR I could sell some stuff I'm really not using right now" rational.

Hindsight being 20/20, we'd all be wealthy card dealers and stock market moguls if we could have known. We've all sold/traded stuff that in retrospect we'd all like back. Too bad that case of 2012 sucked. At least a nice card or two would have lessened the sting.
On the other side of the coin, I'm sure you've unloaded some cards that were hot, and they plummeted afterwards. I'm hoping that would at least lessen the pain