I used to agree with approaching Duncan and Manu from more of a cut-throat business perspective and hand them fair contracts. To do that, you would have to ignore past accomplishments and only focus on the future. From that perspective both Duncan and Manu would probably deserve something like 3-5 million a year.
However, I think the open checkbook is absolutely the way to go with these two guys.
-The chances of us winning a championship probably won't change too much the next few years. Not until we can land a big time free agent or hit the jackpot in the draft. It won't really matter if we keep Duncan and Ginobili at an inflated value or if we happen to get them to accept low ball offers.
-2012: Dwight Howard and Deron Williams are the 2 biggest names but both are rumored to team up in Brooklyn or in Dallas. Outside of those two, there aren't many realistic options.
2013: Interesting options: Josh Smith, David West, Paul Millsap, Al Jefferson.. but no big time, team changing type players.
-Therefore, we have to consider the entertainment and the business aspect of basketball. Duncan (and Ginobili) will fill seats and sell merchandise. They should hit their return of investment (roi) without much of a problem and therefore keep the ownership group happy. Sign Duncan to a 2 year 20 million contract to keep him happy and motivated, fill the seats, sell in merchandise, and wait until 2014 and see if there are any big time free agents at that time.