For example, a trade made with five contracts might be entered at three different prices, and exited at one price, or entered at one price, and exited at five different prices.

With this link, he can choose between a number of supported subscription packages (such as unlimited usage per month at one price or a specific number of usage hours at a lower one-time charge).

This violates the basic building block of finance - the law of one price - and does not depend on any pricing model.