I didn’t say that I would, nor that it would be “however small the difference”; I claim some people would. I also think that, if Uber and Lyft manage to capture the lower-income market, many of their customers will.

Also one man’s “reduced comfort” is another man’s “less luxury”. People make those choices all the times, e.g. when buying cars, train tickets, housing, or food.

Why not?

Or, perhaps you have a small frame and the difference in leg room wouldn't impact you at all.