With iOS7 and Find my iPhone enabled, your phone cannot be restored without entering your iTunes username and password. Your phone is literally worthless with out it.
Doesn't matter. It ties your IMEI to your Apple login so after you restore you're still locked out. I've seen it action after unlocking an iPhone recently.
I don't think you've been following the iOS7 updates closely.
If you ever manage to do a DFU, you won't be able to restore. And if you ever manage to restore and jailbreak, you'll never be able to connect to iTunes, use the AppStore, or sync with Apple again. Which means, the phone is either worthless or at least seriously crippled.
I have jailbroken many an iPhone, so I have a bit of an idea. Apple's security is really quite strong. If you are trying to equate hacking to magic, I don't think you understand it.
