Two thoughts came to my mind when I got wind of this.
1.) DeSean Jackson overvalues himself.
-Does he not realize that he finished well below 1000 yards the last two years in a row?
-Does he not realize that he only put up a whopping 81 receiving yards and no TDs over the last (and most important) games of the season?
-Does he not realize that Dez Bryant has more receiving TDs over the last 3 seasons than Desean has in his entire 6 year career?
There are a lot of better options out there, DeSean. You are not a legitimate number 1 guy.
2.) Maybe he realizes that, with his size, he's at a higher risk of being knocked out of the NFL at any moment than most? Or maybe he realizes that his only asset (elite speed) will likely be gone when his contract is up and he's the big 3-0. Trying to get all the money he can, while he can.