Power is a type of resource, an important one, but not the only one. The more stable a society, the less valuable the resource of power becomes, and in this civilization that has been passed down for over a thousand years, power serves merely as a threshold, much like a degree that acts as a ticket to knock on doors.
Those who are not mages can only dutifully become fuel for society. While mages are eligible to participate in this game, that is merely eligibility because this is a PVP game that started a millennium ago, and there are no such things as Newbie Villages or low-level areas. All new players who join face enemies that are various guild big shots (businesspersons), committed gamers (elites), Level 100 Players (Legendary Mages), and even cheaters (Blood Moon Two-Winged).
The most interesting aspect is that despite being a PVP game, the society is all safe zones, where theoretically one is not allowed to attack each other.