What do you call it when you jailbreak your device to tether in an unapproved manner on AT&T's network?
"Most people" associate jailbreaking with wrong doing not necessarily piracy. There are very few legitimate reasons more technical people jailbreak. Technical people are drawn to jailbreak to tether in an unapproved manner on the 3G network, circumvent download sizes on the 3G network, hack DRM on apps, and a few other things that escape me at the moment that "most people" wouldn't normally do. Plus "most people" don't want to risk jailbreaking for fear of device instability that may create an exploit or damage the device they just shelled out cash and a 2 year contract on.
I don't know about that. I think MyWi is the best reason to jailbreak, but there are lots of good apps out there that are not part of iTunes. Such as Categories which allows you to do folders much better then iOS4 ie you can have as many apps as you want in a folder. You can use Winterboard so that you can display a different icon scheme, background, and add 5 apps to the dock. You can add a really cool shortcut menu to control wifi, 3G, BT, screen brightness, ringer, rotation lock, etc. by swipping the top edge of your screen. You can have the phone tell you if you have any emails or texts without signing on to the phone. My favorite is the app that lets you change AT&T to whatever word you want on the top of the screen. Lots of stuff the iPhone should do, but doesn't.