This presumes that those who buy a game and then return it wouldn't have returned it without the new policy, and that there's more of them than those who come b

This presumes that those who buy a game and then return it wouldn't have returned it without the new policy, and that there's more of them than those who come because of the extra publicity and buy without returning. Considering the rampant piracy of GOG games I think the first group is rather small.