I'm writing an eBook and planning to sell it for $9.99. I don't want to write something so long that readers will get bored, lose interest and not finish the book. But I also don't want to write something short that doesn't seem worthy of a $9.99 price tag. What is a good number of pages that an eBook should be?
Length doesn't matter. It is what is inside that counts. If it gives what the person is looking for then it does not have to be long.
For $9.99 it should contain $100 worth of value. People don't pay for pages. If that were the case you could just fill the pages with random text and have them send you your cheque.