To be fair, there are ways to do it without endangering others, but it is discouraged nonetheless.

Exactly this, thanks.

A bit off topic, but what sort of mp3 player? It crossed my mind a few times that I should get one again.

20 bucks is only labour. You see, that’s where the amortization surcharge comes in, which is 12 bucks/tire and 10 for drivetrain and breakpad usage. There is also a transporation fee of 2 dollars a mile. Oh, and don’t forget the high fuel prices, so there is a surcharge for that which is 20% of the combined transportation and labour cost.