You just don't understand the situation here. There is simply nobody to sell to. No interested parties.
There used to be a chain of second hand book stores in the Netherlands and Belgium called De Slegte which went bankrupt a few years ago. Now there are only a couple of stores left in certain cities under that name, but their formula might have changed.
Anyway, when there was still one in Haarlem I once tried to bring them a stash of as new English hardcovers, good recent titles, nothing obscure. I wasn't expecting to get much. The person working at the counter where people could offer their books for sale was incredibly rude and dismissive and only after much drama agreed to take my books from me for a pittance. I really should have told him to go fuck himself and just left, but I was taken aback by the whole thing.
We Dutch have a reputation as misers which is completely deserved. Never buy second hand from a Dutchman, for example on Discogs. It's highly likely the object is (highly) overgraded. I have stopped buying from Dutch sellers altogether, a dishonest lot. I'd rather import for a few Euros shipping extra. There are exceptions of course, like myself, but we are few and far between.
You're probably going to react negatively to that last paragraph as well, but so be it.