The money glitch has totally ruined the game. Nobody does missions as they don't need the cash, and as you can buy the tank without being level 70 using a glitch, so they don't need the RP either.
All you have is game full of tanks, which have greater protection from being a Bad Sport since update 1.0.8 as if they needed it. I get charged each time they blow up my car. The odds are so heavily stacked in favour of the tank that it's not worth the effort of taking them on.
I've put a lot of hours into this game, tried to play it the right way, not done any of the car selling glitches, but seems that honest players are in the minority. Fingers crossed that a couple of good sessions can restore my faith in this game.