I am not yet a WP7 customer, but blame Microsoft for this. The device was not even available officially until recently and even now, there are just 4 devices available on the site (2 of them are the Lumia phones that are coming soon).
My current Samsung phone is due for replacement for more than 8 months now and I have been patiently waiting for more options. I am not threatening to move to Android or iOS, and WP7 IS going to be my next mobile OS. But Microsoft is seriously frustrating me by offering so few options for someone begging to be their customer.
To be honest, until recently there weren't many options for us and WP7 either. In October all we had available was the HTC Arrive, HTC Trophy, HTC HD7, HTC HD7s, HTC Surround, LG Quantum, and Samsung Focus.
Just recently the Radar, Titan, Focus Flash, and Focus S hit the market.