They are not likely to do this.
They are not interested in low level players,unless they are daft enough to pay out loads of cash like the top players do, and for what?
To get more shards to replace the troops they lost trying to get more shards?
The puzzle games hardly give anything, nothing if you are a very low level town, and given the cost off items in the store it would years and years to be of any signifance, so a couple of runic coins for the top checkpoint is not going to have any impact.
Also not everyone can get the top checkmark, they have made it nigh on impossible to get the top rewards and if you do they have cut back on what they give.
I havent worked it out, but I suspect it costs more to win anything in the competitions than it does to purchase the same items from the game with gold, points or with real money from the bank.
I ask you, 230 ghost kills for 15 Shaman charms, when you need hundreds of them.