Think of it this way. Say you own an old house, and spent considerable time renovating it. It is now is a beautiful thing, and gets lots of attention. Then, imagine someone comes along, takes a picture of it, and begins selling prints of that photo. Imagine that that photo becomes famous (becomes iconic, like the Painted Ladies in San Francisco) and the photographer earns a pile of cash. How would you feel? How much of the revenue the photographer is earning is based on his skills, and how much is based on your work?
That's the question that comes up with all of these: what happens if you own something of value, and someone else tries to profit from it. Not an easy question, in the simplest cases.
This happened to me recently. I designed an ad a few ago, that was pretty successful. Then recently, a painter painted it, making an exact copy, and sold it for thousands of dollars. So, he is profiting from my creativity -- his only contribution was the idea "let's make this art". Nevermind that I think this is the dopiest kind of "art" -- it was interesting when Warhol did it, but after that it is just plain derivative. I have no recourse, because I made the design for a company, so they own it. If the company desires however, they could sue him for making money off of their property. They probably won't (bad press, little impact), but legally they could.
It is all an interesting question.