How do you like being given a pricing range rather than a pricing point? For example:

Price: 20-30$, depending on your satisfaction. At 20$ we are at a loss.

When the receipt is generated, we also take note of some common feature: age, sex, race. After a while, we have a fairly good idea of who will like what. For example, we’ll know that Chinese males tends to like this, while European females hates it…