Interesting about the supply issue, but my 2 orders were probably first in line at 5a day of release. I made decent money selling these vintage GWPs singularly, but I do even better selling curated collections or complete themes in minty boxes to emotional buyers.
I'm going to play "The Hits" again and go with selling the GWP Forestmen, Blacktron, and Bionicle (and whatever comes next, if there is a next vintage reissue) as a collection. It worked well with the GWP coins, Pooh's, and Fiats.
You only need one buyer and that guy is always willing to pay a lot more, but it has to be a collection, minty boxes, and have a strong reputation as a LEGO seller. That dude ain't on BrickLink for several reasons (he doesn't know about it, hard to find collections on there, no pics usually, complicated shipping and returns, etc).