| http://www.w3.org/ns/prov#value | - Theres a lot more to it than just that, but the degree of "sellability and risk aversion drive the system in particular directions (just look at all the XYZ 2/3/4/5 sequils in single player games to see the risk aversion in effect and the MMO sphere is not exempt from it, specially with the budgets required to make a AAA one).
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