These water ionizers and purification systems started out 20 years ago as a multi-tiered sales scam. Most of us have known somebody or been approached by an acquaintence promising great wealth and financial independence by "networking" with hundreds of people selling products such as Amway or Kirby vacuum cleaners. You don't actually have to sell the products but simply sign up other people to sell their products, and then you make a cut of everything they sell. They always end up being a big pyramid scheme and nobody ever makes what was promised, or they end up losing a ton of money.
I have been been an avid salt water aquarium hobbiest for a long time, and if you want to talk about people who are obsessed about water quality, try chatting with people in this hobby. Ionized, de-ionized, reverse osmosis, they do it all. Everybody claims that their water systems are the best and charge an arm and a leg for their products. My aquarium has above average growth of fish and corals, and I use good old tap water that's completely unfiltered and I only dechlorinate it. I've tried many of the filtration sytems and I always wind up going back to tap water. It has just the right balance of minerals and nutrients my critters need to thrive, and if it's good enough for them, then it's good enough for me and my family to drink and cook with.
Here is a good article on the ionized water systems and why they should be avoided.
http://www.alkalinewaterionizers.org/consumer-reports-why-are-kangen-water-ionizers-so-expensive/