Everybody that REALLY wanted a warden has one. that's why they're not selling. market saturation. but even if the buyer sells at cost, the fact that he had 20 GW's at one time is unnecessary to the final buyer. had busse offered these as a regular item we wouldn't see these prices. and since it seems busse made a ton of these wardens i see no reason why they weren't offered as a regular item to begin with.
The Game Warden is a special offering through the Busse Company Store. That is why they aren't a "regular" production offering per se. Just like Randall does with Dealer Specials, Busse has done with the various Game Wardens, Heavy Hearts, Fat Outlaws, Mole Jacks and whatever else Skunk collaborates with Jerry on in the future. I believe this distinction makes the difference when considering the relative rarity of the Game Wardens at least when they first came out.