Our rating system is awful to say the least. Any rating system, to be worth much, must be repeatable by different individuals. Its not.
First, understand that the used gun market may actually have some honest people. But we also have a bunch of ruthless crooks. So most collectors have established a rating that doesn't make fractional percentage stops. We list a gun that you'd think is perfect at 98%, and I've never seen a 100% gun. I've looked at a bunch, and factory new isn't always even 98%. Then we reduce it down to 95%, which shows very little wear or even handling marks. Then the next drop is to 90% and is still really nice, and just out of what most feel is collectors grade or investment grade. Call it a great condition shooter. We then drop it to 80% or 80 to 85%. Those seem to be very nice shooters. Below 80% is still a shooter, but what most would consider showing considerable honest wear. Below that it really doesn't matter too much.
So back to the issue at hand. Anyone who rates any gun at 93.4% is just a crook trying to blow smoke up your rear end. He can rate a gun anyway he pleases, but no one else can take the gun and objectively repeat his ratings. At that point the exercise becomes smoke and mirrors, and is usually an attempt to squeeze a potential customer into thinking the gun is better than it really is, or that the rater is a real expert. I'd guess he's a crook. I wince whenever I see anyone who feels he's got the expertise to rate a gun that closely. I like the ratings used by David Carroll or Jim Supica use. You get the gun and are pleasantly surprised at how good it is to be rated that low. But you won't see them stooping to over rate a gun. Their reputation is too important.
Want a fun game to play? Pick up a gun or two and go to a gathering of gun nuts. Pull the gun out and ask the "experts" to rate the gun as best they can.

Your numbers come in all over the board, and particularly with guys who have no stake in the game. When someone is selling their own gun, you seem to see high ratings that aren't justified. Give them some slack, they're just trying to puff up the value of their gun. Then run from any deal they propose.