I think that a new 6k reward is called for. Of course, lord Greg, gangs that have already reached 6k hours deserve the new reward as well, even if the gang already has a subway station.
Alan, I like the melee idea. I know you guys (iFreeze) already have a custom heal staff from winning the Halloween zombie survival competition, but something along the lines of a heal staff seems a reasonable reward for 6k hours to me.
I personally think that 6 hats for getting 2k hours is far too little, considering most gangs that reach 2k have more than 6 loyal, hard working, deserving members. It's unfair. So, for 6k hours, I think 10 people at the least would be reasonable. Some may disagree, but I think that makes sense.