[jchcollins]

Having been at this hobby off and on since 1986, I've got a laundry list of mistakes somewhere mostly too long to bother with.

Recently, not remembering what cards I already have and not having any type of online wantlist seem to hurt me. It's why I currently have 3 copies of a '67 Topps Aaron / Mays / Allen LL, and why even if priced right - I typically don't buy '67 high number commons when they come into my LCS - because I can't remember which ones I already have.

Selling things that later skyrocketed mistakes stick out some still. The one that comes to mind was a nice '52 Topps Jackie Robinson that would have probably been PSA 2-3 range, that I sold raw for $500 in about 2002. Whoops.