If all us POD or direct-publisher authors go on Amazon, and in the reviews point out which ones make US money and which ones only make collectors money, sooner or later Amazon will cordon those off automatically.
I WON't do this is I no longer have the books - but BUY FROM THE AUTHOR FIRST.
This isn't to run the collectors out of business. It's to make sure the authors get paid first. In the long run, this can only be good for the collectors, because the authors will be able to produce more books to sell.