I think people use cheapo rear skewers on trainers because nice skewers can get scratched up by being used in the trainers. I'm not sure if this is caused by mounting/dismounting, or from the pressure of riding on the trainer.
After I sold my old road bike, I found out that I accidentally had left my trainer skewer on that bike -- oops!



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, so any nick from the trainer would just add more "character".
