Keeping venomous reptiles can be a huge pain just due to red tape and no consistent laws.
Between federal, state/provincial and local by-laws there is a lot of hoops to jump through that have no influence of safely keeping or handling these animals.

Granted this might cut down on a number of fools keeping them because they are "bad a**" animals, it doesn't help serious herpetologists, venom collectors(for antivenin production), or add to safety of the community or the handler.
The best models I've seen are the jurisdictions that run an "apprentice" type of program.

Venomoids are also occasionally available but, a snake or two has been known to re-grow the severed ducts to transport venom to the fangs.
Even a venomoid should be treated the same as a true "hot" herp.