Nope! I always sell my iPads and iPhones for a profit or close to it. I'll use 4G LTE when the new iPhone is in my pocket.
No.
The wifi version I think is a better deal if you have a phone that is already tethered and/or you are always near wifi.
Why play the extra $130 to have THE OPTION of using 4G. I'm happy with my choice.
The Wifi Has GPS. I tested it. in the middle of the park. It found my location.