Not sure why this is down voted. If this is because my armchair stats are wrong, I'd be very happy to be wrong. Otherwise, I was not saying textbook is no good.

Not sure why this is down voted. If this is because my armchair stats are wrong, I'd be very happy to be wrong. Otherwise, I was not saying textbook is no good. I'm just speculating that many people couldn't not enjoy even an invaluable book.