Because a CDMA radio is going to completely destroy it?Apple's profit margins?
The funny part about that is AT&T isn't even going to get started with LTE until the end of next year, while Verizon is going to be well on their way towards it.Verizon's LTE rollout will be starting in a year or two, making a non-exclusive iPhone 4G possible (and rather likely). Now, whether or not a Verizon customer would WANT a iPhone 4G is another issue because if Apple doesn't put in CDMA radios, there's no fallback network or voice capability (Verizon stated they would be using LTE for data). That and all the LTE networks need to be built from scratch. So so much for Verizon's "superior network".
I don't think Apple is going to do a Verizon LTE phone. Especially if they don't want to make a non-GSM version. They would probably do an AT&T version, but it shouldn't be expected until at least 2011 or 2012.