I thought it was two gold for every sicario you kill. But then, one day, I only got 1 gold for a tombstone.

Same here. But,wouldn't total damage increase on a higher level person anyway? As long as you're going for max destruction, a higher level will have more buildings to take out. I think it's a combo of damage done and the levels of bases you hit too.

Besides the port change, I don't have much to complain about this game. My cartel members view it the same way as well. It's just a game and is something to keep you occupied when you're pooping or want to get away from the in laws. Yes I have spent close to $100 on it but it was my choice...