I have begun farming cleanup points by trashing whatever i can. I was wondering which reward is most valuable to players and easy to sell. Thanks!
If you mean valuable in terms of gold that one could get by selling it, perhaps the Pigments, first because they cost the most points and second because they are added with new every now and then and whatever is newer is usually more wanted.
Otherwise, for some players the luck jewels could be valuable because usefull or also some of the sets, depensing on the needs of the players.
In the end, though, it is all relative because what is important to some may not be to others and viceversa.