It worked well for me: 5 times our usual sales, at a 60% discount -- that is still twice the usual daily revenue. Plus the option to earn more when it comes to renewals.
Sometimes sales attract customers that wouldn't have bought before (either the price was too high, or customers were unfamiliar with the product).
Sometimes sales simply pull demand from the future (folks who would have bought, but haven't gotten around to it yet). If you experience the former, great! If you experience the latter, then you're actually losing money.
