You're not the only one, Morg.
My interest in GI joe greatly declined a few years ago.
But this year, a month ago to be exact now, I decided that Gi joe and I are done, going forward. I'll keep what I like (or want to display). The rest, I will be bringing with me at shows, and not look back with any regrets. And as opposed to my doubles, if someone wants the items in my collection, they'll have to expect to pay the asking price or I keep them. Anyway, the way I see it, EBay's international shipping and brokerage standard costs have changed dramatically over these last years, that it makes the collectibles that you find at local sellers/ conventions look cheaper, provided that the price is the actual going rate for the item, and not something blown out of proportion.
As a collector, my habits also changed. I always said that I would never walk into a Thrift shop, mainly out of pride. Well, screw pride. I saved tons more money than I ever could imagine by going there, and not on collectibles, but on clothing and children's books too. And even found toys that I enjoy collecting for a mere fraction of what I used to inject into the hobby. I used to be a completist, but in order to keep up with the ever increasing pricetags, I knew I was going to hit a wall financially someday If I kept this up, and I almost did several times, so I had to accept to come down from that pedestal for good, and I feel really GREAT now. To the point that an incomplete action figure for 50 cents but in great shape makes my day.