err, those billion dollar datacenters are all about moving bits (and moving the bits to entice you to move the bits). Apple has to recoup the cost of those systems.
but you're right, the discussion about how to 'fix' inapp purchases shouldn't be here. It's really all about the contractual requirement to lock prices across all e-retailers, which I find is anti-competitive. One way is to fudge the pricing based on the 'size' of the transaction, which was really my point (bits and bytes), and a bad one at that.
The issue isn't 'stupidity' of Apple (their model is very smart, as their profits rise dramatically from a .99 to a $19.99 purchase), it's the agreement to fix the price everywhere to Apple's price, which again, is smart on Apple's part, but on the surface, it seems like it's using it's monopoly to fix prices to it's model.
I think you are very confused. Much of your post seems to lack all understanding both of the post you are replying to, and the App Store business model.
But, since you continue to push this red herring about bits, let's harpoon that fish for good and all...
What you pay Apple to offer your app in the App Store has absolutely nothing to do with its size, the amount of data served to customers installing it or unlocking a feature, or anything even remotely related to bits. Did you understand that last sentence? If not, or if you still somehow think it's related to serving bits, keep reading the first sentence of this paragraph until it sinks in. This is not a point of argument, so don't bother trying to make an argument that it does have to do with bits served. It just doesn't, and that's an immutable fact, not a point up for debate.
Now, are you grounded in reality, or do you still have thoughts about App Store costs being related to bits served. If the latter, jump back to the previous paragraph. If you now understand that it's an indisputable fact, not an opinion, or point for debate, that the money you pay Apple has nothing to do with bits served, you can continue reading. Otherwise, keep rereading the preceding paragraph and this until it sinks in.
What you pay Apple to offer your app in the App Store is a 30% share of the revenue your app generates. Yes, that's right, the App Store does not operate on a cost of services model. The App Store operates on a revenue sharing model.
There, see how simple that was to understand once you threw away your misconceptions?
No, don't click reply and start typing about how it's just my opinion that that's how it works. It's not an opinion, it's a fact, the truth, reality, the way things actually are... The App Store operates on a revenue sharing model.