

Because not everyone is going to or wants to drop serious cash for a big set. Some people don’t have the space or whatever the reasoning may be.
Also, imo The Expanse is a bit too adult for Lego to adapt. But they did make an ornithopter from Dune (the new one, complete with a floating Baron Harkonnen minifig), so who knows.
Nail salons? Most nail salons have a pedicure service. I’ve gotten a couple myself.