As long as you provide your snakes with proper hides, heat and humidity it doesn't matter if they're in a rack, glass or PVC terrariums.
It all comes down to the convenience of the keeper. For a breeder with a large collection it easier and cost effective to have the snakes in racks. I personally go for looks so I have my BPs in PVC enclosures even though it cost an arm and a leg. Others might have another way they like to keep their BPs.
It also depends how easy you want your life to be. I've had my snakes in glass tanks when I started out and it was pretty challenging to keep both humidity and heat up so I switched to PVC enclosures. They are heated by RHPs and keep perfect humidity so I don't ever have to worry. If someone has the luxury of making a climate controlled room, it would also be a prefect rack room for multiple snakes. As in any hobby, you gotta pay to play.
Ball Pythons are popular because they're easy to keep and aren't very needy so as long as you're providing your snakes with proper care they need, they'll be happy in any place.
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