Let's look at the facts:
- Most paper books are already subject to VAT (90%+).
- The margins on ebooks are already much higher than paper books (due to reduces production, distribution, storage, returns, and tax costs).
- The only reason ebooks cost as much as they do is due to lack of competition and the publishers wanting to continue to sell paper books.
So while publishers might try to exploit this opportunity to raise prices on something which already costs too much, let's not pretend that the VAT (which is effectively already built into the price, since they're 1:1 with paper books which DO pay VAT) has anything to do with it.