They only offer it because, Alltel and TM were the ones that came out with it. VZW only offers it because of Alltel's buyout and not losing many customers, and neither of the three want to on going unlimited for under $60.
Bah, I know they don't record everything, but the rep used it at a excuse. Oh well, the AT&T A-List+Rollover is prob the best plan I can think of.