The hard reality is those in the business of providing opinions face a significant conflict of interest as a natural byproduct of their trade. In turn, there are two types of these practioners, those that use their position for personal gain behind the scenes and those that avoid doing so at all cost.
Those that do the latter embrace full disclosure of all financial dealings, direct and indirect business dealings, and avoid even the appearance of conflict where such disclosures can not be made. Those that do the former avoid such disclosures, live in an arena of ambiguity, and sometime use aggression as a tool against parties whom demand transparency. The more subjective a buying decision, the more susceptible that market is to nefarious business practices. In its most contrived form these practioners can go so far as making intellectuly obtuse claims with vigor and stand behind subjectivity as a defense.
I point this out not to indict any individual but rather, as it relates to audio reviewers, to point out the simple truth that the preponderance of skepticism in the industry could be mitigated by aggresive financial disclosure and common sense regarding product claims. Those that avoid these principals, IMO, deserve the greatest scrutiny.