Very, very tempted to say I told you so................but, that would be a bit sad and quite unnecessary as I expect some people have lost a fair bit of money.
I agree with much of what Ian Harper and Steve Gunn usually say, even if this sounds like a contrdiction.
One of the reasons I was unable to implement much of the marketing, as promoted by Joe Polish and anyone attempting to market products that kill dust mites, is, as Ian suggests, the psychlogical impact.
If you understand the way our brain works, you will understand, that it's extremely difficult to eliminate a negative thought, once it becomes established.
You should never, ever, introduce a negative thought, in your marketing, or discussions. If you do, you are creating unnecessary conflict in your prospect's head.
This is what the marketing of "dust mite killer" type products, was doing and with others smartly marketing " the healthy aspect " of their flooring, carpet sales and cleaning, was suffering, instead of benefitting, from these products....................if you want to sell such products, it might be better to detach them from your cleaning business and offer a completely separate business, aimed at peoples health and wellbeing.