A friend told me a guy with red UK (who got it through PvP) told him it cost more gold to get it through battlefields than to buy sparks
And here we are. Mafio group, 10 wins in a row inside CC of equals = 600k valor with 60g only spent for 10 victories (At level 12). 20 sparks? Pfff
Of course if you stay low level you have people bashing at you for rigging accuses and stamp of shames while you overthrow money in that battlefield and waiting in que for years, but those are other stories.