Since this is a sponsor paid forum, they don't want that sort of thing stealing business from the money folks. Not a bad notion, if youre one of the money folks. And we all benefit.
By the same token, it would benefit them to get off their high horse. Other sites allow trading among members and they are funded the same way. A few old models and half-starts traded around keeps the members on the site and active - and that's when advertsing pays off. After all, you can't advertise to people who are absent.
Seems there is room for compromise, doesnt there? Apparently, others know it too, since I see suggestions in this very thread to go elsewhere, if you're inclined. Youre even directed to the place. Or just be "informal" about it, among friends, etc.
So how are these money folks being served by their strict policy when that happens? What value do they derive?
That is always the problem with unyielding policy - it's prideful wielders eventually cut themselves off by employing it.
Personally, it's okay with me.