Quote:
Originally Posted by ski_power
Probably they gain a %age of the fee that amazon charges. Yep, I'm pretty sure. Since they encourage you to buy a Kindle through their link where they say they get a commission, similarly I'm willing to bet they get a small fee everytime they deliver using 3G.
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I seriously doubt this. Pretty much anyone can set up an Amazon Associate account and get credit for purchases made that were referred from their website with a special URL, but as far as I know there's no way to get a piece of a transfer fee.
More plausible answer: Wifi is a new development in the Kindle line, and sending to the free address prior to Wifi wouldn't have been real convenient so there wasn't a reason to support it.