The gradings seem too random for me. I have had a couple of 85 figures that look perfect to me, just as good as any 90 I owned. But I also had an 85 Hoth Snowtrooper where you could clearly see marks on the plastic torso which should have lowered the grade.
As much as I would love to own a complete set of AFA 90 or 95 figures people are paying a premium for a number on a sticker which is being determined by somebody else.