Well, I'm a believer in an objective world in which not all needs are equal.
I can accept that which need is important or not can be difficult to ascertain. But I also hold that in many, if not most, cases, it's very easy.
Despite the cult of the individual and the reverence with which subjective taste is held, I'd go on record to say that some (most) people have buy products that fulfill irrelevant non-needs.
For an easy to agree with (but real) example, heroin addicts ands Milli Vanilli listeners both buy products that "fill a need". The question is more whether they should.
If for some reason you prefer today's Western culture to that of 15th century, be certain that it changed mainly because of some people pursuing their irrelevant non-needs, as seen by then-contemporary "normal people".
Finding such toxic-but-still-used product is a good opportunity to both make a living and improve life in general. I suppose the hardest part is to detect and understand the real need being filled.
Certainly enough, education, and other ways to change culture, is a more profound way to change the way people fill their needs, and especially what they even perceive as needs. E.g. the need to serve a bloody revenge is by now mostly absent from a typical Western society, while the need to one-up a neighbor is still pretty widespread.