A LOT of the big boys do it *cough*GTS*cough* but unless you pay attention, you are never notified of this fact.
I think about it this way. You are buying a "Guaranteed Gallery Spot".
All you are really paying for is the "Guarantee", after that it's just a regular gallery. Are the regular galleries being skimmed? Of course. So really it is expected that your gallery will be skimmed as well.
Some TGP's rely so heavily on trading and are also so full of paid galleries, that if they didn't skim the paid ones too, they'd probably shrivel up and die.
