That's where the "preaching" part comes in. May or may not work, depends on your oratory skill, and how you present it.

Because hey, there is no such thing as free marketing, especially not as in free beer, and for that you can forget anything about "quality" and "what people want". But word of mouth is the closest you'll get.

In the end, effectiveness of it still boils down to the same thing, understanding non techie people, agreed.

Edit:
And I could care of kitchen appliances, regarding the conditions of production, and quality of use (proprietary maintenance and all), aso, but I cannot find any forum on the topic

but I see what you mean : )