posey gets $167M over 9 years.— Jon Heyman (@JonHeymanCBS) March 29, 2013
The deal makes Posey the second-highest-paid catcher in the Major League Baseball behind Joe Mauer of the Minnesota Twins, who inked a eight-year, $184 million extension before the 2010 season.
While Posey's contract is legitimate for a player that is the face of the franchise and a key to their lineup, throwing out this much money for any player will have long-term consequences down the road.
An example of this is to look at how Mauer's contract has affected the Twins the past three seasons.
At the time of Mauer's signing, the Twins payroll jumped to $113 million in 2011 (which was the first season the extension kicked in) according to Baseball Prospectus.
However, the payroll has slowly declined since then, with the Twins letting several key pieces leave including J.J. Hardy, Michael Cuddyer and Joe Nathan.
Heading into 2013, the team's payroll has been reduced to $76 million and the team could cut more with Justin Morneau (and his $15 million salary) in the last year of his contract.
Will the same fate happen to the Giants? Well, the Twins and Giants are on different ends of the baseball spectrum at the moment.
The Giants are coming off their second World Series championship in three years, while the Twins are mired in last place of the American League Central.
While the Twins were letting key pieces go that were veterans entering the twilights of their careers, the Giants have guys who are not integral to their success and can be replaced with cheaper options.
In fact, of the players currently on the Giants roster, the only key piece that could leave is Pablo Sandoval, who's contract expires after the 2014 season.
Otherwise, the Giants have done a terrific job of setting up their roster long-term.
Over the past calendar year, San Francisco has managed to lock up Matt Cain (eight-year, $139 million extension), Madison Bumgarner (six-year, $35.5 million), Angel Pagan (four-year, $45 million) and Marco Scutaro (three-year, $20 million) to secure their nucleus of talent.
Even with the spending of the past season, the Giants still have a payroll of $132 million for 2013. With Barry Zito likely coming off the books at the end of the season (unless the Giants pick up a $7 million option) that number drops to $77 million in 2014.
That low number will allow the Giants to lock up any young prospect that comes through their system and still have enough weapons at the major league level to produce a winning product.
With Posey locked up through 2021, all Giants fans have to worry about now is how much longer he'll be able to survive behind the plate.
All contract info obtained in this article via Baseball Prospectus.