The charts are interesting, but I wonder how meaningful they are. For example, does the sales volume at $9.99 reflect what long-term sales would be, or is the

The charts are interesting, but I wonder how meaningful they are. For example, does the sales volume at $9.99 reflect what long-term sales would be, or is the number artificially high because people saw the price drop and thought they should buy immediately in case the price went back up. Since the $19.99 price followed the $9.99 price, is that number artificially low because the $9.99 price already drained potential customers from the market? Of course, none of that argues against the conclusion that $99 gives them more revenue than $9.99.