JR was underpaid after winning the 6th man award. Made back some of that money from the Cavs story book season last year.
Apparently the Sixers, like they did with Ginobili, made a "hard push", maybe forcing them to overpay.
Cavs were smart for doing this. Don't mess with success. 10.6/2.7/1.6/1.4 in the finals against two good guards must be worth something.