True story.
The other day a very good friend of ours was having lunch with my wife. The friend is house hunting, the kids have moved out and their $20m house is a bit big, so she’s looking at places a bit smaller. So she goes to see a place and the owner, a record producer, has a dedicated room with about 5 turntables, acoustic panels, the whole works. The friend said to my wife that it reminded her of my music room. Boy, was I flattered!!
I think for the majority of people, what Darko is really saying is that we all have different points at which we consider the diminishing returns seem to be worthwhile, so there is no need to spend beyond that point.
On the other hand, there are people for whom money is no object whatsoever, so there is no point at which returns diminish that need any form of compromise. If recommended a $500,000 audio system, some say yes without batting an eyelid, and others would spend a month on a home loan and then spend another month negotiating the price. That’s a difference in human nature, not what two people can afford. What you can be more or less certain about is that they will both have cars parked outside that cost 5 or 10 times as much as the hi-fi system.
It is obvious that people will make recommendations to reinforce their own decisions. The value of online comment seems to be more about a product’s design and performance rather than any recommendation to buy it or not. That depends entirely upon whether that person’s point of diminishing returns is the same as yours. When a customer goes to a dealer, they should work to a budget. An unscrupulous dealer might try and pressure the customer into raising the point of diminishing return, whereas the savvy customer may find that the point of diminishing return can be achieved below their budget.