It really has to do with size. However there are island localities such as hog island, cat caulker ect... that max out around 5 - 6ft. Hogs also have very pretty colors and differ a lot as individuals. But all the morphs are for the bigger BCI and BCC boas. I think if more people bred the smaller localities then they could become more popular. Right now they average around 250 whereas you can get a normal ball python for 20 at an expo. So for a novice snake keeper its easier to get a normal python or for a little more money a cool morph.
Balls just happen to be in that sweet spot of being big but not too big and as such took off. In 20 years maybe boas will be up there but I don't think anytime soon.
What's even crazier to me is how the reticulated python has taken off in recent years. I think they are probably more popular and kept than boas nowadays. That also could be due to size since boas are medium size and too small if you truly wanted a big snake haha.


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