Mr is a gamer and he'll get them, definitely, if they're free.
But if he has to pay, he only gets the ones that offer him something that he cannot get or earn in-game that he absolutely wants/needs. New missions and maps are usually an allure for him to pay, but he often waits until IGN does a review before he shells out the money.
Sometimes, if he's got a back log of games he needs to play, he'll wait for a Game of the Year edition and just buy it with all the content in one-fell-swoop. Especially if he's not too impatient about playing it.