As I suggested in the other thread, it's not just about increasing sales. It's whether the lower price increases sales enough to produce an economic benefit.
Again, if the book normally sells for $10 and you drop the price to $2, you need to sell
at least five times as many copies just to match the same revenues.
More importantly, as an experiment this wasn't constructed very well -- as might be expected from such an impromptu implementation of the concept. As a result, this may end up more as a Rorschach test than a definitive answer.
If you're genuinely interested in the psychology of pricing, by the way, you may want to hit the books and read up on behavioral economics.
