I'm also fairly sure if you asked them whether they'd rather pay $189 to fly across the country in a jet that might be as much as 25 years old or $589 to fly in a jet that they could be assured was no more than 8 years old, the $189 ticket wins by a landslide.

I don't see any reason to think a similar price-sensitivity wouldn't apply to other forms of seat-rented transportation.