I second your observation(s). There are a few pre-creed vintage COACH resellers in particular who amaze me. One on the west coast hoovers up BIN bargain items listed by sellers who haven't a clue as to what they are selling (giving away), marks them up by factors of 3x+, and there they sit, sit, and sit waiting for (forgive me Sy Syms) an uneducated consumer to come along. Another in the south obviously has excellent sources, but sets BIN prices at the extreme high end of the scale, sets the listing up for 30-day/good till cancelled, and there some remain for 1+ years. And then there's the third who buys on eBay and sells on etsy at significant markups (as if we don't notice) without lifting a finger to do even minor maintenance.
It's sad that all these gems just sit on shelves waiting for some deep-pocketed buyer to eventually come along. But then I'm probably just jealous at getting beaten to treasures listed at giveaway prices and also having to compete with flippers who only value these rare pieces for the profit they perceive they can reap without providing any added-value by rehabbing, repairing, or restoring.
Well that's my rant for the week.