My guess is he doesn't really need the shards, so save them for a later point. Think about it, you need 5 champs for questing, 5 for AW defense, 3 for AQ/AW attack. That's 16 champs needed. Once you have whatever magic number you want, why NOT save up for something/someone better?
Comments
A: You have been saving those shards since the game began
B: You are a bigger spender than COWhale
C: You're a hacker
Good on him.