I think that the problem starts in high school, back in the old days we were all required to have a jock and a uniform, and everyone showered with soap after pe. Today I would suspect that is not the case. I was reading that the lack of showers after pe is causing poor health habits among high school kids. When I was in school you learned positive habits for life, and being clean was a large part of the training.
Back to the swimming, I swim at a public pool and I have noticed that the swim team kids like to keep their speedos intact in the shower. I would guess that not washing them off causes the lycra to lose it's strength at a faster rate, so parents have to buy new gear?