What we can get in the different shops is not much, for an example the alliance shop no scrolls and a few starlight stones. If your in an rather active clan I usually have 1-2k left after buying the descent stuff, that mostly is the essence of creation.
Put in that you can buy bread for example in all shops.
And please do so you can buy more in regular arena store, most things are locked away in really high rankes of regular arena or in 3-3 mode.
That most us regular players never can reach, even if you spend a little. In a game mode that is very skewed and poorly made.