Or just normal to fixate on collecting subsets of pins? I seem to be currently working on three such sets with outliers: Kemper, MTG & PAX Aus ’13.
However most of my recent pin acquisitions have been via eBay with an extremely poor hit rate, thanks to snipers. Though that’s probably more to me not getting ebay and focusing on other things: grinding XP in my TOG for Maus & blasting raiders to goop/ash in the wasteland(s).
As for trading, I’ve mentioned in other posts that I’m regretting not buying more core sets when I’d the chance in order to create a starter stockpile, but it’s early days for me and it might get me into clearing out some of my CCG stockpile…or not(I keep on getting into ones that die or have a limited player pool).