I really liked doing the Black Market, Warm Heart delivery but now the time is decreased really low 2:00 minutes, and it's hard to do without losing the hearts. Any other ways to make good amounts of money?
I know this topic is two years old, but go fight large amounts of either Chinese troops or the Allied troops. 50k per enemy kill, plus a payout from enemy vehicles destroyed, you'll be rich in no time. If you're friendly with both, then keep going and stop reinforcement calls from getting through. When necessary, save and reload the game and when you come back, you'll still be Friendly.