Just increasing price will lead to what arnk said. The bombdelay isn't perfect but at least you don't get a cluster of thors all the time. While you can time the thors, how many people actually make it work? Not sure if its possible but heres a suggestion: Having a siege mount causes A.) Kill Reward: -35% (% varies) B.) Exp Earned from Kills: -2 (Wont go below 0) C.) Stackable And maybe D.) Reduce Team Reward Ratio So if you have 2 siege mounts, your money gained from kills drops by 70% and your initial exp gained from kills will drop by 4. Meaning you will only get 1/2 exp if the enemy you kill gives an initial 5/6 exp. Seeing how most people use thors to get a quick income or exp boost, this will negate that effect but allow people to use it to destroy an enemy bombline/gunline if needed.