Yesterday, my wife and I went XC skiing. On the way back, the left rear tire on our car suddenly went down. We mounted the limited service spare and discovered the left rear was toast -- a gash over 4" long all the way through the sidewall explained why it went down so fast.
We have AWD, so we had to change all 4

But there was no other option so I forked over the $511.
She wasn't bothered by the cost at all. This is the first time in many years that we will spend more on car tires than bike tires (previous cars have been econoboxes which use tires that are cheaper than bike tires)
EDIT: Mods, move this to foo