The most popular single word Bill Belichick, during his tenure with the New England Patriots, has emphasized is VALUE. Whether that pertains to the draft or contracts, it does not matter.
If the Miami Dolphins are idiots to pay wide receiver Mike Wallace an exhorbitant contract at the expense of a starting left tackle, that does not mean the other 31 teams should do so for the remaining unrestricted free agent wide receivers. In the meantime, Tannehill will either run for his life on the majority of pass plays or end up in a body cast at a local Miami hospital.
Sebastian Vollmer's new contract is the epitome of highway robbery for the New England Patriots organization. Sebastian Vollmer is now the eighth highest paid right tackle in the NFL on an APY basis for who some consider the best right tackle in the NFL.
» Over the Cap- Top NFL Contracts: Right Tackle
Bill Belichick is more concerned about roster depth than doling the highest paid contracts for players at their respective positions. You don't always get what you pay for in unrestricted free agency, refer to the Washington Redskins on that topic.
However to state that "Bill Belichick is the walking antithesis of 'win now' mentality" is blatantly false when following offensive players are still on their rookie contracts:
Wendell - 2008 UDFA (two years practice squad)
Solder - 2011 Draft
Vereen - 2011 Draft
Ridley - 2011 Draft
Mallett - 2011 Draft (backup quarterback)
Cannon - 2011 Draft (backup right offensive guard/tackle)
Bolden - 2012 UDFA
Dobson - 2013 Draft
Boyce - 2013 Draft
Sudfeld - 2013 UDFA
Thompkins - 2013 UDFA