Consumers IME prefer the predictability that tiered plans offer. That is, many people would rather pay $40 for 400 minutes when they usually use 300 - 375 than

Consumers IME prefer the predictability that tiered plans offer. That is, many people would rather pay $40 for 400 minutes when they usually use 300 - 375 than $.11/min even though on average the PAYGO plan would be cheaper.