Why is it so difficult for a fellow pilot to ask for a ride no matter what carrier you ride on, regional or mainline? I've been seeing a lot of pilots and hearing a lot of stories from other crews that pilots from another company who listed for the jumpseat either don't come up and say anything because they got a seat in the back or are in the jumpseat and come up and tell the crew that they're the jumpseater instead of showing a little respect and asking for a ride. Why is that so difficult for people to do? I see it happen at least one flight per trip someone does that to the captain I'm flying with.