Are you trying to say Mitt is stashing all the books in his basement?
No, it is a way to funnel money to the next presidential candidate that he can repay when he gets elected in the form of political favors...for those not quite as weasely in their thinking as our elected leaders.
Like clock work, politicians release memoirs about their incredibly boring lives up until that point right before they kick off their campaigns. For some reason, regardless of the politician, they keep knocking them out of the park. As a group, they are the most successful writers to ever grace the planet.
Newsmax did the same for Palin's book. You are right this is done often.