Because it's very expensive. It's around 700 dollars if you want an individual order. It's much cheaper if the community buys it in bulk.
$700 is tempting, are you sure?
They are selling a Dolch set for $90+ / I'm sure a custom double shot set would be well beyond $700, on the other hand buying a self group buy would make sense, you could just order and sell the extras if you have the initial resources
Some time ago, they misunderstood one of my emails and gave a quote, it was $500 for a full blank set
I want a Penumbra too, It's generally possible to buy sets from people after they just receive them, yet I think I'm going to skip this window, too many keysets already