I think the story is plausible. When I first caught wind of the comic I was already too late to buy at below cover. I ended up buying 50 copies off a distributor for 65¢ each. Back then, there were a lot of distributors. The Buyers Guide was full of ads from small distributors. Even after all these years, I still have a few left. I'm sure there huge stashes still to be brought out to the market.
There's no sense in flooding the market, when you can hopefully get more in the long run. Why kill the goose that lays golden eggs? Of course, if you need to cash out soon, now is a good time.