For non-commercial photomanipulations, I'm no where near good enough to even think of selling prints on dA. I just assumed, with the lack of a download button and the addition of a purchase button, that it had to be bought in order to be used.
Oh, this is one of the few images on this account I decided to put up for print. In the process I disabled the download button because of the high res file I submitted for print, but you can still use the full size preview in a photomanipulation and go as far as to sell the photomanipulation for dA prints. What I'm more concerned about is those would seek to use my images for mass monetary gain without receiving anything in return (like profits over $100), but I don't have any problems with those who want to make a little extra cash on the side, what I would consider the more "honest artists".