I take umbrage at the idea that he's playing to what he perceives is a misconception just to rip people off. Either blue Alps is a different, rarer switch and therefore worth more, or it's just a white switch with different dye, therefore worth the same. You cannot rant about how stupid people are for thinking they're different switches, yet also charge more for one than the other. You can't have it both ways. Hopefully the idea that he charges more for blue Alps is itself the mistake! (Though in fact, blue Alps is indeed rarer, and most definitely a different switch, although we don't have conclusive proof yet that it feels better, or a clear idea as to what would have been changed.)
As for a plastic plate — I suspect it actually improves switch feel by taking up some of the bottoming out impact in tactile switches (linear switches cushion your fingers better as the force does not drop after actuation). I don't have any particular preference — I just felt that the price seemed excessive considering that it most likely cost less to make than a metal plate keyboard, and that not everyone would want a plastic plate. It's a nice keyboard; I just don't like the layout and lack of Windows keys.
A plastic plate will also dampen the sound, which is good or bad depending on how you feel about the noise level that Alps switches generate!