
If the price is wrong, no sale occurs. But price is not something that can make a user happy. Think of price as something that instead prevents a user from being "unhappy."
But even the right price makes a user "happy." The things that make users happy are on a different plane, entirely. Coolness, features, form factor, user interface and lots of other things people find they can do with a service and device are the essential parameters for driving "happiness." And the attempt to find "happiness" is what drives the purchase.
If you want people to buy something you make, you have to remember that "happiness" and "hygiene" are not on the same continuum. There are two different scales, and you have to be on the right side of each scale.