Could you explain (or perhaps give an example) of what you're talking about regarding levels providing utility as opposed to power? Also do you mean levels as in character levels or zones? For me, utility means something along the lines of "more abilities" (whereas power would be something like a linear / multiplicative increase to stat weights) but having a more expansive choice of abilities is akin to having greater power. If you mean utility as access to, say, cosmetic options or unlocking some sort of functionality within this website (or whatever other external tool(s) that will be tied into the game) that's something, while not novel, that's still infrequent (and depending on how original the offerings are could work). Regardless, utility in whatever sense you're using it is still something finite; something that can be obtained. What, then, would keep people coming back to those zones once they've gained the said "utility" from them?