Which just shows ‘highly edumacated’ people can still be pretty stoopid, too.
It's because they have just enough education to fall for the Dunning-Kruger effect. Scammers selling things like ionized water use big words to make people think they're experts on ionization of water. People with *some* education think they know what all the words mean, and they're impressed and buy the product. People with a greater amount of education recognize that all the big words only add up to a scam. The Dunning-Kroger effect shows up a lot.
I use ionized water for almost everything. Except for scientific research. When I don't want pesky ions interfering with experiments, I use water that has been filtered and deionized through a very expensive water purification system. After washing laboratory dishes, we rinse them with deionized water before setting them out to dry.