Re: It it to do with the selling price I bet
How does that stand if the patent holder says, "okay we are going to charge everyone 0.001% of the purchase price of the completed device" Company A, B and C say yeah sure, that is fair and pay. Then premium company D comes in, and says "wow, that is way too much".
If they (the patent holder) charge a different percentage to company D, then it isn't fair on A,B and C.