The App Store does not give users all the other value of Steam, such as the Steam Community, Chat, Cloud, Achievements, etc.
I've been arguing with some reps from a few of the other big up-and-coming distributors in games about this... players don't give two shits about having an "integrated" distribution platform if it means losing all the game-focused features of the less integrated platform.
Single-player games may do well on the App Store, but (without any numbers to back it up at this point, just an edumacated guess) I'm willing to bet that multiplayer games do way better on Steam.
And as a side-note, I'm really really damn happy I bought the last Deathspank on Steam on my Mac Mini instead of via the App Store, because it turned out that Deathspank is utterly unplayable with the newer Apple mice that don't allow both buttons to be pressed simultaneously. It was very nice being able to just redownload the game on my desktop after I found that out (first non-laptop Mac I ever bought, and bought the game the day I got the Mac Mini, so I wasn't yet aware of how useless that mouse is). Then it was doubly nice because Steam Cloud let me pick up and continue playing on my laptop computer whenever I was out and about and bored, and of course move that game back onto my desktop when I got home.
These are the kinds of features that differentiate distribution platforms from the users' perspective.
The only thing that matters to the game makers is the exposure. Steam is a lot nicer for advertising and getting users to look at your game that the App Store is, especially if the developer/publisher takes advantage of the incredible power of Steam sales.



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(those were my last wine attempts)