They're right in the sweet spot:
-Easy to breed
-Easy to keep, space efficient, easy husbandry
-Can be an intro reptile for someone, so the customer base is wider than other reptiles
-They have tons of morphs and combos that combine in predictable ways - tens of thousands of possible combos
-Although predictable, there is a lot of variation which makes the opportunity for selective breeding more exciting than many of the colubrids
-Colubrids are too slender and quick - I actually don't like 'skinny' snakes very much where balls do not give me that primal uncertainty feeling. I know there are others who feel the same
-Clutch size is small enough to maintain a base value per animal and big enough to keep enticing odds on 2+ gene combos 'hitting'
etc.
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