I think part of the issue is also that some characters in the bm don't want negative CR, so they won't risk their character being caught/their allegiance revealed (which is a whole different issue with many characters aligned with certain factions and not taking consequences for that involvement), and that a lot of characters in it aren't the sort to capitalize on the sort of things the black market is historically into.

It doesn't help that Leandro feels a lot more hands off than previous black market npcs were, though that could also be on players for not reaching out for more connections with npcs. More pcs in positions of power would help a lot I think.