There are several obvious good reasons why someone might have to give up on an iphone.
- They lost their job, and couldn't afford the monthly phone bill.
- They moved to an area where they got zero AT&T cell coverage.
- Or they needed the phone for work and got transferred to a long term job site out of AT&T coverage.
- They ended up with serious vision problems, and needed a phone with tactile buttons that they could operate purely by feel.
- They needed a particular smart-phone application which wasn't allowed in the App store.