Change the cost of the walls

I think it will be a good idea if ssupercell change the cost of the walls from gold to elixir. I dont know why i always have 6 million elixir in my th8 base. I have that problem because it doesnt matter the troops i upgrade in the lab, i am always going to have 6 million because i attack a lot.

gold for defense, elixir for offense. if anything, search cost should be changed to elixir