Missed my point, it would be like charging more for vinyl than leather because it lasts longer, same as the carpet argument, the wool costs more because it is the superior product.. Get the wool and be done with it...
It is a natural product like leather, you could also pay more for less hp, but who would... You might as well get the best for the best, if it there wasn't a price difference they would probably be out of stock with the wool like Kirkham was when I got my car because of the high demand...