As with anything in real life, "it's complicated" and there are a variety of factors in play here.
* The spectrum issue is a real one - the article has merit. The bits/hz spectral efficiency that LTE gets is much higher than EVDO. Verizon watches things like this and is obviously taking action. They've done similar things in the analog to digital transition - this isn't out of character at all.
HOWEVER, at the same time:
* VzW also fears becoming beholden to one or a few suppliers, especially dominant ones. This is true on the handset side as well as the infrastructure side. They want as many horses in the race as they can get - basically they'll bet on all of them if they can. Windows phone? Sure, pile on...
HOWEVER, at the same time:
* VzW also wants the hot products - meaning, the iPhone. They know that if Apple keeps on cranking out desirable products, then VzW wants to offer those products. It keeps ARPU up as hot products can withstand pricing pressures.
HOWEVER, at the same time:
* VzW watches the bottom line closely, and I'm sure the iPhone subsidy bothers them if it's materially higher than other phones.
...and so on and so forth.
A couple of other thoughts - first, I don't believe the "no commission" angle one bit. There are manifold ways to influence sales staff which don't involve a direct commission. Spiffs are one example. You can also give store managers and regional managers quotas and they'll get the message to the line sales people very unambiguously even if nothing is written down anywhere.
Also, as we all know, there's a massive hit to the network whenever an iPhone is released. Verizon keeps a VERY close eye on network performance and they plan ahead very well - they're very proactive in this area as opposed to reactive - they spent nearly a year throwing vast sums of money at their EVDO network to get it ready for their iPhone launch - I estimate it was well over a billion (with a B) dollars and was likely even more than that.
They may be pushing as many devices to LTE as they can to so they can get the best idea of how their LTE network works before the LTE iPhone rolls out. Test networks and "friendly users" are great up to a certain point, but stressing the network with real users is always the best test.
But, of course, this won't be the ONLY reason why they'd push other devices... Like I said, "it's complicated."