The thing you may not or (may) understand about Clack Factory is their colors and even materials are... experimental? yet refined. On top of that he uses 2 and even 3 'shots' of plastic creating one custom mold cap. Each meticulously QC'd as well. The skeletor is just a continuing OG art design of his.
I was lucky enough to win a Oktoberfest in the EliteKeyboards Fall drawing, that was like my 4th or 5th try, and it just happened to work out randomly. Its hard to be aware of timings of random sales... so you dont feed the ugly flippers, and the profit fully goes to those who deserve it.
Not to say I wouldnt buy a set of your caps. just trying to say I agree, and help understand you just happen to be looking at some of the highest quality, yet un-numbered, exclusively sold 'art' keycaps.
Your design might be very cool done in colored translucent polycarbonate.
like these