After the th11 update supercell are planning to change the name of the game to better reflect what it is about. It will be called Clash of Gems.
Personally now I don't spend more gems than I get from obstacles. I don't get enough loot to keep my builder busy so I don't need to gem upgrades. Also th10 is boring so nothing new to gem and don't want to go to th11 till I've near maxed.
This is of course a joke (first part not second)
