Well, this kind os special shops (b and a grades for a/aa) are ruining the server's econmy. I bet you hit 75+ lvl and still you won't have a full dc set!
Allthough, it's more fun to craft these A grades than hunt aa to get them. The advantage of "crafting" A-S is that dwarf classes are viable, even as alt chars.
About S custom zones, ally lvl 5 is much funnier :D
My opinion is that custom farm zones are for high rate, only pvp servers.