The very limited thing seems a bit Wonky but I would venture a guess as to the return of those paints in a few months. As they did with the edging paints.
And What else is weird is that they are not a primer... as I first thought... They go on a primer...
And paying extra for Primer doesn't mean its not worth it necessarily. I gladly pay the GW price for the Black Primer because it works the best for me. The White or yellow sure I'll go to army painter. And I know there are several awesome painters out there that swear by the Krylon Walmart Black Primer but it doesn't seem to coat as well for me the way I prime I guess.