"Dynamic pricing" -- does anyone really like that? I've seen reports of online booksellers (no, not Amazon) giving people different prices based on the account they use. No one really likes to feel like a sucker. EDIT to add: Some people might bring up airline tickets or hotel rooms. Limited analog inventory, not infinite digital inventory.
Sorry, had to say that :) It's fun for me how analog/digital have become synonyms for material/virtual.