I'd like to say I won't be buying another DLC, however I think the analogy you have used is pretty accurate. I for one feel like I've invested too much time into learning the mechanics and as a result feel too comfortable because I know what to do, when to do it and although I'm not a great player but I like being able to switch the PS on and just get on with playing. Moving to another game requires me to learn a new set of mechanics and get used to the feel of a game, in part my own laziness granted but it's more to do with the fact I think I will feel like I've wasted the money I have spent if I just give up on it.