I completely support the AFA system. As long as grading is completely objective (which in and of itself I'm sure can be debated), it is an excellent way to "define" quality. From my experience with Gen 1 Transformers, there are quality differences between 90, 85, 80, etc. and I think the grading is consistent. Especially with buying sight unseen from eBay, having a serial numbered grade gives buyers peace of mind of what they are actually getting. If someone says "mint in sealed box", well...that is open for interpretation, and I almost got scammed buying a MISB Gen 1 Megatron that wasn't really sealed.
As far as paying a couple thousand dollars more for a 90, over an 85, that's an individual's choice.
But as far as getting statues graded, that's ridiculous. I used to not even think the box or packaging or COA was needed, since I have never sold anything anyway. With this Spike 12'' figure, if there is sealed tape on it, I don't see anything wrong with grading it. It does seem silly to do so with something so newly released, but to each his own.