Why are there so many more Dumerils available compared to Mad. Ground Boas? Is it as simple as more were/are imported over the years than were/are Mad. Ground Boas or have they just proven easier to breed?

I am fortunate to have 1.1 Mad Ground Boas that are only 4' so I have a while to wait for maturity but it just seems this genus is represented like 20:1 Dumerils-to-Mads.

Bill