Because Adam is one of the greatest Patriots of all time.
Taking a home town discount is done often in the NFL but Vin. is a KICKER. Not a top 3 QB in the league. Brady is the face of the franchise and is set as far as money goes. You can't compare a QB's salary to a kickers. Ugh.
What makes you think "Adam" would agree to retire as a Pat? I wouldn't be at all surprised if he gives you the finger one more time.