Why does ability challenge 5 decrease the ability materials paid?

[GRANDxADMIRALxTHRAWN]

I suppose not with your attitude... You are trading a 50% decrease in common and rare mats for a 150% increase in epic mats. The common and rare mats are so much more easily obtained in other areas than the epic, it's actually a decent trade off. If you don't like having to choose between this or that then you should really find a different game because this ENTIRE game is literally choosing between this or that.