Paper books are mass produced and mass marketed. One size fits all.
Hypertexts are created specifically for us, just before we read them. Hypertexts adapt to our needs and adjust to our whims.
If one reader chooses to pay for elegant, high-resolution screens, she can then enjoy an elegant page with precise typography and elegant reproduction.
Another reader may read the same hypertext on an inexpensive, generic monitor. The type may be less elegant, the reproduction fidelity may be poor, but the reader's cost will be substantially lower.
Today, of course, even the best screens are inferior in resolution and color fidelity to current standards of printing. We may expect screens to improve as long as people are willing to pay for the improvement.