Sling Upgrades

The sling upgrades are way too high. People are forced to use lvl 1. It costs 540,450 gems to get to lvl 10. Here are the cost to get each lvl. Costs wood too but is manageable.

lvl 2: 20,010
lvl 3: 30,020
lvl 4: 40,030
lvl 5: 50,040
lvl 6: 60,050
lvl 7: 70,060
lvl 8: 80,070
lvl 9: 90,080
lvl 10: 100,090

Total: 540,450 Gems

My point is that it cost way too much to upgrade and now that Archers and Witches are improved people use them more often. Now like in Stable1 there is a reason to make slings so Daed please lower the cost of the upgrades. People use them now.

Edit: This is beta but it applies for speed as well.