If they are reselling the phones to wealthy people in the same country then your logic holds true and to be accurate this does happen. BUT the majority of the phones are exported overseas. So they are causing a shortage of units in the USDM while the phones are shipped overseas, to countries who are unable to currently purchase the iPhone.
If you look at it as a global market, demand is being fulfilled all around the world. Sure, in the US a few less Apple fans might have units but in another country Apple fans (ones who are so fan boyish they're willing to pay 2x-4x MSRP just to have Apple) will have some units.
If domestic fans in the US were bigger fans, they could choose to snatch up the units online for 4x MSRP and I guarantee you the "Asian scalpers" would be selling domestically here in the US rather than shipping the units back also.
Except in the US people are only willing to pay $100-$200 above MSRP for a unit, where as in China they're doing 4x MSRP, so the units go to the highest bidders.
I would wager that a great deal of the units being sold in China were bought by non-Asian scalpers who also looked to taking advantage of the market conditions.
My point was simply that ALL UNITS end up in the hands of Apple users, the only distortion is whether its fans who wanted to buy at MSRP or fans who were willing to pay a lot more. Location isn't important, as I don't consider a US Apple fanboy to be any more precious or special than one in Hong Kong or China.