Therefore, the manufacturer, who stands to profit from the approval of the drug or product, does. Almost all drugs on the market enter in this way. Another case is Prozac, for which studies and protocols to gain approval where funded by the manufacturer. And if you want to read some frightening and shoddy work, check out the FDA reports on drug efficacy trials. So the big money looks for proprietary equivalents with a higher profit potential.
Ethics are no more a problem in scientific research than anywhere else.
The gadgets, goos, and gurus. You can find whatever you want, or think, supported and sold by someone somewhere. I'll not even mention politicians of every stripe. We are not a completely altruistic, caring or competent society. That's the way it is.