Even if not trade with other players, sellback should be an option. Mounts for example, once you get your next one, you don't go back - so why not sell back that bear or rhino for the smaller players that are just now getting up to the title they can get one??!! Of course they have been gone since they were made to benefit us!! The bears went the first day, the others all gone now, only 3 per realm is not enough since there is NO way for anyone to EVER get one now. What motivation is it for the poor smaller players?? I don't know, but the Dev's have odd ways of showing they want people to stay and play. And don't give me the "rare" excuse, because to me, since it's tied to title like heroes, you should have an opportunity to get one without spending an obscene amt of gems.
Then there are all the other stuff we collect along the way..