"What I especially dislike is when some does an add on for a free stuff item and puts it in the market place. That just bugs me, and doesn't seem right." When someone does it for their own product, like if you make a clothing item for freestuff, but then sell textures for it in the MP; I think that's fine. On the other hand, people selling add-ons for items that others have created for free just seems very, very wrong. If the seller has an agreement with the creator of the model, it would be nice to see acknowledgement of that (ex: add-on for creator's object by merchant, in cooperation with creator), otherwise, it just seems unethical to me.