I think they are going for ‘collector’ and ‘Darkglass asthetic’ here.
Only 100 made is more of a cool marketing stunt than anything.
This will drive folks to put DG preamps in MM basses as well which also helps sales way beyond the 100 basses they will sell here.
We do stunts like this all the time, its more about the press than the product.
Drives brand awareness, coolness and other sales.