See my post above. Feige is a business man first and foremost. He understands that they will have to break the bank to retain RDJ. He has to protect himself. The only thing that would mitigate the deal is that it is an ensemble movie.
Nonetheless, I wouldn't sign for Avengers 2-3 for anything less than 50 million plus around or less than 5% of WW gross. Close to a 100 million dollar deal. I can't imagine what Depp's salary was for POTC but this would be more than that.