That's obviously wrong, actually. The people made happy by the sdk are not the developers but the users of the apps, and that's a lot of people - not just the current users, but also people who are encouraged to become users because of the apps. There's some news now about iPhone apps recently blessed by the Vatican to let you keep track of your sins (for purposes of obtaining absolution, not for purposes of advertising), your rosary recitations, etc. This one little set of apps isn't going to make a lot of people happy, so Entourage isn't going to develop anything like this. Multiply this by a few thousands or tens of thousands, though, and you've got a lot of people.

A well-stocked app store is a huge, huge selling point, but Entourage cannot stock one on its own.