You obviously don't understand.
It's not a performance incentive in the contract. It's doled out from the league as a part of the CBA:
Players have been paid nearly $700 million cumulatively since the inception of the Performance-Based Pay program, which was implemented as part of the NFL's 2002 Collective Bargaining Agreement with the NFL Players Association.
A great shot is when you pull it off. A smart shot is when you don't have the guts to try.