Buy the recasts. Is it moraly wrong? I dont think so, you arent hurting yourself, nor GW, nor the old sculpter. And if your concerned about GW losing cash, or something use the the money you saved to buy their paints or something. Im guessing the pygmie production isnt what you would call a money making scheme either, its probably something the dude cast for himself and never used. So i wouldnt worry about perpetuating his illegal dealings. And its the principle of the thing is still bothering you let me pose this question:
Would buying a sculpted green on ebay of a space marine be moraly right? I havent used gw parts that have been illegaly casted, in fact i havent done anything illigal at all, as long as i call it a "Space-age Marine" or "future warrior" But im still stealing their idea, im stealing the work of many a concept artist, isnt that wrong?? So if thats wrong what if its a sculpted green of a movie character? like say for instance Sauron from LOTR, im stealing the idea of the armor. Just because its not so apparent, and just because i used talent in reproducing those pieces doesnt make it my idea, its still theft. Even if its not illegal, and i can do it without fear of persicution, does the law set the table for right and wrong? I think if you think about it in these terms you'll see that by doing that, you have to do that for any sort of idea/work theft, and if you did that you'll end up living in a bubble. Its like the people who get paranoid about germs, if you go through some massive ordeal to sterilize one area of your house that for some reason caught your attention, the next thing you know youll become aware of the next spot thats not clean, and the next, and the next, untill you cant do anything, go anywhere or live your life. And all for the fear of germs, a fact of every day life.
You need to face it, you live in a dirty world, you cant be worrying, or judging the morality of other peoples actions. All you can do is keep your own practices clean, and lead a moral life according to your beliefes.