Yes. The only time I've sold stuff was when I drowned my K750 and needed to fund my next phone (as a poor college student) and sold my iPod 4G.
But otherwise, I have a W810i, N82, Motorola Milestone sitting here. The latter 2 are smartphones that AT&T don't recognize as ones, so I'm keeping them so I can plug my SIM in and tell them to take me off the smartphone plan
whats the point of doing that though?