Most of the buyers think that touchscreens are very future and normal buttons are very past, because touchscreens are like magic, look! And because everybody uses them. And because more pixels. And because they don't have to reliably enter text most of the time. Especially not looking at the phone.
I think it all still gets down to people poking screens with their fingers thinking it looks smarter and more elegant (LOL). It has a lot to do with how it looks for others.