There is no inherent difference between paying for a paperback book vs. paying for an eBook. It just so happens that most eBooks do suck because there is no quality control in the digital world. Anyone and his dog can "publish" an eBook so naturally the quality will tend to be low. But if you can sift through the bullshit and find the legitimate eBooks sold by actual experts in their respective fields, then there's nothing wrong with eBooks.