Yes, some are more interested in the money. Some even sell junk with a wall wart at high prices.
Others are pursuing research ( without publishing it ) to see what works better and what does not work so well.
Why not put the research information out for others to see? Posting such information is basically the same as making a claim. Making a claim gives government agencies jurisdiction to shut a company down.
Hence: the only claim currently made by ParaZapper is that their current zappers can kill a number of different microbes in water based environments.