Quite common among Websites where any money transactions are involved, there's the concept of virtual currency. Virtual money can be used in many contexts when the correspondence between the actual currency value (US Dollar, for instance) and the value the user gets paid is not fixed, in other words, there's some expected fluctuation. GPTEngine includes a points system so users can be credited either in cash or in points. The point value ‐ i.e., its exchange rate to any actual currency ‐ is supposed to fluctuate and to be periodically adjusted according to the financial situation of the GPT program. Users can redeem points for cash in the members area.
Reasons for employing points instead of actual cash may include: