Making money with a printer as a service only?

Yeah ofcourse, I'm not talking about that though, my point is when you go and buy a model to print and the guys who make them charge you for a model but then say you cannot sell the printed version, why is that? Because they are selling a model they have made on let's say a marvel character so are they not committing the same crime? Seeing as that is not their character in the first place?

I have gotten permission from some people on cgtrader for purchased files to be able to sell the print but what I'm asking is why do I need their permission?. They are okay to sell me a file of a character they modelled based on again say a marvel character but I'm not allowed to sell the printed version? Forgive me I dont understand the logic.

/r/3Dprinting Thread Parent