Why Do They Do It?
Because they can! Because they make a lot of money doing it. Because people buy them.
I, personally, know two people who bought Bettas because they saw the cute bowls online and thought they'd be cool as decorative items. The fish came later, from-- of course-- a pet store-- right after the cute bowls arrived! One of these people ditched the bowl after deciding to keep her three Bettas in Brandy Snifters and a tall, cylindrical vase that's only about 2" in diameter, if that!
Somebody is marketing them as pets to keep in vases! We see pictures of those set-ups everywhere!
The average person who buys his/her first Betta is looking for something more exotic than a goldfish, but just as pretty and easy to keep, for the office, kitchen, or kid's bedroom.
Aquarium setups are expen$ive. "Betta Bowls" are not.
Betta Displays in many pet stores are set up on endcaps, with the poor fishies in small containers, ready to go. Bowls, food, and Betta supplies are right there. They fit on the endcap. Everything is small, and cheap (except, perhaps, for the bottled water). They're marketed to be an "impulse buy," which makes an inexpensive, convenient-to-find set-up part of rationalising the impulse. "I got everything I need for this fish for only $20, including the fish, and the food will last a year!"
Bettas in pet stores are cheap; it follows to reason that it should be inexpensive to keep one. After all, it's only one pretty fish that lives alone, right?
Most of the salespeople in pet stores don't know anything beyond what's printed on the packaging.
The packaging says "Betta Bowl" or something similar. Smart salespeople often try to get the customer to go for a bigger tank; but folks don't readily part with a lot of cash for impulse-buys.
Impulse-Buys make money for all stores, even pet stores! In some cases, if the fish is lucky and gets owners that care for it, they ultimately do research and wind up buying a bigger tank.
If the fish isn't lucky, and its owners really are buying a decorative item, when it dies, they just buy a new fish. Cheap fish don't last that long, right?
Regardless of the scenario, pet stores still have sold those tiny bowls.
Why do
we create a demand that takes Bettas out of their natural environment, subjects them to the stress of handling, shipping, unnatural climate and food, and find it acceptable because we give them bigger, better living conditions than "Betta-Bowls" provide?
I'm Guilty, Too!