I book imediate returns all the time, often it is the same crew. I could care less what they say or think. Most have been very nice and fun. One time there was a grouch in F on the way down and she was a grouch in F on the way back. THe FA's/Ga's Attitude has NOTHING to do with you getting on the same plane twice. It's really much more common than you think and not just Mileage Runners. I have never considered it a walk of shame. I have more difficulty with questions from friends and family than I do from Airline Industry employees.