I understand what you're saying but, speaking as a former business owner, you WANT to know why people are declining to buy your product. If that didn't happen, if people just kept their mouths shut and simply turned to another product, then not only would you be left dead in the water but you also wouldn't know which way to turn to improve your position. That is why small businesses have suggestion boxes and large businesses do surveys and spend millions on market analysis.
Consumer complaints drive industries forward and help to refine products and services so they meet the needs and desires of the target demographics. Die-hard fans who spend all their time downplaying all complaints and attacking those who explain why they have a problem with a particular product, they are the ones that create a negative effect. Businesses love loyal customers but they hate customers who foster resentment.