I really don't get how the NFL makes up their fines and I'm not sure anyone will ever understand it.
On the other side, it's Lynch's money to spend and if he wants to avoid the press and pay fines, he's free to do so. If I was him I would just give the vague yes, no or no comment answers for 5 minutes (or for whatever the "mandatory" time the NFL agrees to in his contract) after the game and move along with my day if I wanted nothing to do the press.
I guess this is something the players association should bring up in the next contract negotiations with the NFL. Until then, it's part of the contract they sign when the players want the privilege of working for the NFL corporation (just like any other business when you sign a contract to work for them).