That makes sense -- thank you for the explanation.
I think they are trying a different business model on some of these. With the Dark Lord, I think they realized they could sell more without having to artificially limit themselves to a set number. I think they are hoping for the same with the skeletons. But, as far as I can tell right now, people aren't as excited about them as they were/are about the DL.
Still, if they don't force themselves to commit to a particular number, they can stop production if people just aren't buying them (so they don't end up with lots of boutiques trying to unload them), or they can keep going past 500 if there are more people out there willing to spend the money.