It's not sacrilege. It's just the wrong question. Here's the right one: Do you feel your books are good enough that people will buy them at the same kind of prices they pay for other books?
Or, basically - at what level are you willing to whore your talent out?
I can't imagine putting up a 75K novel which I've worked on for months for $0.99 and hope to Gawd I make back the investment.
I'd rather put that hard work into a novel that sells for a decent price and gives me money at the end of the day.
And it sure ain't gonna happen at 99 cents.