I was just looking at the guild points on the Black Sole stack page. I thought that 33k for 2.78 fish was a little odd, went to the singles page and that looks right.
The pricing listed in the Guild Points section for stacks are using the stack price times the amount required for the max points.
Black Sole Stack
NQ: 2,100 HQ: 0 Max: 5,840
Max = NQ x 2.78 (33,000 Gil)
Gil/Point: 5.24
Black Sole Single
NQ: 2,100 HQ: 0 Max: 5,840
Max = NQ x 2.78 (6,000 Gil)
Gil/Point: 0.95