Dont need them, because I am Solo Player.
Any economical thing you want??
Ok its your bussiness.
And you want your costomer who didnt buy expansion but paying monthly fees be patient for 2weeks frequently weekend patch?

And this is my opinion upon your boosters.
I dont want tower thing, thats make worlds got more heavily lag.
You didnt learn from other successfull MMORPG games?
Players wants their Shops or venders, or houses.
Why then tower???? huh??