I don't know how many of you remember this but back in early 05, Andy announced that the FoB series was going to be an unpainted series so that collectors could do their own painting but then (and I'm not 100% sure about this) when Andy saw how good they looked, he decided to have them offered as a painted range, which I think took collectors by surprise.
Regarding the 500 of the 09, and actually the whole FoB, I don't think they were originally made in large quantities because Andy didn't think it would have that much appeal in the US, it being intended that this would be mostly of interest to European collectors. However, apparently US collectors wanted them too and he was surprised how well it sold overall. That is probably why the 09 went quickly and he offered a 10.
I do remember that when he announced a new King Tiger (WS 71) and the repainted Char, he said they were being made in "limited" quantities and this ultimately resulted in a big brouhaha because he increased the numbers on these two items and people thought they were strictly limited items when he never intended that to be the case. If you do a search, you could probably find the threads discussing that.