Hplarm, let's speculate that one of your ancestors invented, say, the rubber band. He invented it, patented it and got crazy rich for having such idea. Every rubber band factory that sells rubber bands, give you a percentage for every single rubber band sold.
Obviously, by the time is your time, by right, to cash in, you're filthy rich.
Given that this is an old invention, those factories think that those percentages should not be pay to you anymore because you're already rich, would you be ok with that determination? Would you give up those rights?