Hmmm. Really interesting idea. I also have reservations about this but it might be an interesting thing to experiment with. It would certainly be an interesting alternative to the current mission system (not a complaint about the mission system, just an observation). I'm not sure about the subscription fee, but if you are handing out those big bellybutton perks then it might be justified. An alternative might be to make the quests squad oriented. Only designated squad members could sign their squads up, and this would then encourage cooperative endeavours, rather than simply becoming another vehicle for lone wolves to do their thing. So you would ratchet up the score requirements. For example, a squad has to destroy 12 enemy buffs in a 2 hour period, or 30 fighters in a 2 hour period. Then the perks get distributed among the squad members signed up for the quest.
Just an idea. But it's worth exploring; done properly I don't think it would emphasize the "gaminess" of the environment, but would instead result in objectives that produced some more realistic scenarios. Kudos for thinking outside the box anyway.