I'll happily take slightly more expensive knobs, sliders and buttons over a touchscreen.

I know exactly where, e.g. my fan speed knob is and I can reach for it confidently. Or I can take my eyes of the road so I'm not blindly groping around the touchscreen to find the increase/decrease button, assuming its even on the right screen and I don't need to go through several menus to find it. Cost doesn't enter my mind in this scenario.