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Because it's more profitable for Apple if you get your 3G from a tethered iPhone?

Maybe more profitable for AT&T. It's not like you're not going to buy an iPhone because they add 3G to their laptops.

why would it be tethering be profitable for Apple? AFAIK they do not get a cut of the tethering charge from providers.

Because then you have to buy an iPhone (and proprietary cables, and then you might find some fun apps etc.)