Greyhound's new priority seating option is another example of good economics. If you've ever ridden on Greyhound (especially from NYC!) you know how bad the lines can get and as a result how irritated people can get. In some senses, I think they're replacing poor management with a cost-benefit exchange, but that doesn't change the fact that it makes sense.
Movie theaters in major urban centers do the same thing by allowing movie-goers to reserve seats in prime locations of the theater, sometimes even with a snack/beverage service. Its been this way on Broadway and stadiums and airlines all along, so why not?
Repugnancy costs originating from cultural mores. That's the answer. But is it a good one?