czeskleba wrote:
I doubt Wein or Wrightson get any character creation royalties for Swamp Thing. Neither Marvel nor DC started doing that until the 80's. DC grandfathered Kirby's New Gods characters in, but that was an exception.
It may have been before the new contracts, but Wein definitely gets royalties for Swamp Thing.  When talking about the Swamp Thing TV DVD set, he said:
I'm always thrilled for anyone to read or watch my work, but this particular release makes me especially happy. Unlike any and all of my Marvel stories and characters, I see royalties when any of my DC characters appear in other media. So, should you decide to buy this collection, a few cents of your purchase will ultimately see their way to me.