I have to say, you do have a bit of a valid point here, notwithstanding that many on here don't like the guy. There can be a "vibe", as you say, sometimes on the GA boards that likes to pick apart big books for sale, even CGC'd ones, arguing for lower grades and prices for some reason. Sometimes it's valid for clearly over-inflated asks, but sometimes it's not IMO.
I think it's just part of being on such a site as the Boards with all kinds (collectors vs. dealers, sellers vs. buyers), and you have to navigate and educate yourself accordingly. At the end of the day, it is THE most informative place to learn about GA, and I learn here every day even after being here for over 10 years...... I still consider myself a rookie compared to the big boys like Gator (THE best for sure )