yes
No
Well if ur using a iPod touch or iPhone, it's the app store that's built in
no
yes you can in the app store
To restore in-app purchases in Infinity Blade 2, you must download the in-app purchase again. You must use the same iTunes store account name from the original in-app purchase.
Buy the Tetris app on the App store.
No it shouldn't unless you have it restricted to do so.
you buy it at the app store
Theft.
Yes, you will be able to make purchases from both the App & Music store.
iRate LOL was removed from the App Store but there is no information about the reasons
No, you can just use your own credit card.