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I also found this disussion amusing. Why can't you use the iPhone's Personal Hotspot? (Settings > Personal Hotspot) available since, was it iOS 4.3? I can use my iPhone to share my Internet connection with Wi-fi, Bluetooth or USB. Isn't this functionality available in the US, as it is here in Australia?
This should be clarified in the article before you persuade people to buy something that the iPhone already does.
US and some UK iPhone users have to pay $25-$30 a month to enable tethering. $15 one time saves a lot of money. Also people who are on AT&T's unlimited data plan would have to switch to a 4GB plan to enable tethering at all.