"Flogging...useless products" are your words, not mine.
I don't believe for one second that cotton insulation is useless in an acoustical application. All I have to do is stand in my closet (full of cotton clothes) to know it absorbs sound. It may even work marginally better than fiberglass (although I have seen absolutely no independent, objective proof of this.)
What makes cotton useless to me is the price. If I have a project installing 2000 sq. ft. of insulation, do you really think I can go to the homeowner/customer and say, "I'm going to have to jack your bill another $1200 because I want to use this material that these people say is better, even though I can't offer you any proof whatsoever..." and have them accept that?
Get real.
I suppose I could offer it as an option, but when they asked me if it worked better, my honest answer would have to be, "Probably not." I'd appear like I was trying to simply cheat them. Screw that.
You say I should "evaluate your products". How exactly am I supposed to do that? Blindly buy a whole bunch and cross my fingers that it works as well as you say it does? I'm not that trusting. Even so, the results would be subjective and lack any sort of accuracy.
If you're going to make these claims, I believe it's your responsibility to test your product (in an independent, third-party acoustical facility) and prove it's superiority. Until you're willing to 'put your money where your mouth is', you're not going to win over skeptics like me. And there are a lot of us.
Or you could strive to reduce the price of cotton to be more inline with fiberglass. It's ironic that with the billions of pounds of cotton produced and thrown away each year, the stuff isn't more plentiful and cheaper. Maybe at some level it is. I would probably use it if it were 30-40 cents/sq.ft. To eliminate itching, I would pay that price.
As for the "questioning your motives", I don't. You're in this business to make money and so am I. I question your tactics. You try to shove cotton down everybody's throat and deny that anything else works. Maybe if your people put a disclaimer on their posts, "Fiberglass and cellulose work, but in our opinion..." it would be easier to swallow (pun intended.)