No kidding. A car tire is much more complex, has to meet very high standards, contains a lot of layers of various materials, weighs probably 100 times as much, lasts 10 or 20 times longer even with 10 times the weight on them and running at 5 times the speed and hundreds of times more power, yet they don't really cost much more.

I'd like to find a good source for a reasonable tire that would last me 5000 miles or so, and just buy a dozen of them at a time if that would get the price down to the $10 or so they should cost.