Prepaid vs Postpaid - why the difference in price if its the same service ?

[AlexJohnson33301]

I own my phone outright and I have a Prepaid account which is on autopay.  A post paid account is significantly more money.  Why is a postpaid account more money for the same service ?   Does the post paid accounts cost more money because post paid gets more delinquent accounts and prepaid by definition can never be delinquent ?  Also, is the 4G service is the same regardeless of pre or post paid ?

[UpstateWinds]

Postpaid gets premium data, up to a certain amount, higher deprioritized limit on certain plans, better CS, ability to add a network extender, device payment plans, roaming.