Let's just take Job's statement at face value: we will agree that there isn't much market for books or book related technology.
Then let's do the math:
- The US population is about 300 million people.
- If 57% of them read 1 book a year then there is (at the very least) a 171 million unit market.
- The average book price is $18.00
- That translates to something like a $3 Billion market. . .
Most people would consider that a pretty good market!