I've been looking for sleeping pads for camping. It seems they have 3 grades; upper end, medium grade and low end. I don't understand why they charge so much for a "Pad" even the cheap/low end egg crate like foam is over 20 bucks and a good 2"+ thickness or better is over 100 bucks, just for a simple pad??? We're not talking exotic/rare materials or tons of labor/machines to make these, why are they so expensive? Any comments or thoughts?