I bought Civilization V a month ago with the silly expectation that the add-on modules could be installed in 10.6. Nope. You have to buy 10.7 before App Store will allow you to buy any of the modules. I then made the mistake of buying one of the modules (Mediterranean) from Aspyr. Aside from the headaches of having to use Steam to download the module, it wouldn't even allow me to do an install because I'd bought my original version of Civ V from the App Store and therefore can't give a code. I spent extra money for nothing, and I'm pissed. I really don't care much for the yakuza-like distribution agreements that give the App Store exclusive control of parts of apps. I refuse to part with $30 for Lion and cripple my Mac Pro just to be able to fully use an app that I already paid for.