Well, I know that I am VERY careful in how I read the liscences for what we buy - and it is one of the reasons we don;t go anywhere near the 'free' items. If I paid for a model or texture I absolutely intend to use it commercially - otherwise there would be no possible reason to spend the money. If I bought something and it turns out I couldn't use it commercially (for renders, not reselling the mesh) then iw oudl be pretty annoyed and I would expect my refund immediately.