We've gone around and around on the "over charged" part. Since I'd like to be a professional writer, and support professional writers, I'm on the side of the value being in the story, not how that story is delivered. In the old days, if you wanted to read the story first, you paid a premium for the hardcopy. In the movies (also an intellectual property issue), you pay a premium for seeing the movie in a theatre.
In both cases, you can pay less once the story has been told in the premium market. The devaluation isn't in the delivery system, but the timing.
As for mistakes - a typo in a paper copy is a word misspelled. In a digital version, it can mean a link is broken, which would leave out a whole section.
Both suck. One is just WAY more obvious.
As a writer all I care about is maximizing the number of my readers and in maximizing my income. The rank stupidity shown by the big publishers in sticking to outdated perceptions and market models does not accomplish either. Over-charging reduces sales, which reduces income to the author, which is the ultimate devaluation of the story. To make matters worse, the big houses are paying writers proportionately less for ebooks
than they do for hardcovers. The sloppy and indifferent preparation of overpriced ebooks is just the icing on the cake, to coin a phrase.