It has become fashionable to question the well established facts citing some unverified tests / comparisons carried out by unknown people often at obscure locations to which the person questioning is not privy to any information. Pretty naive IMO. One would be given more credence if they cite personal example but alas, we all are armchair critics after all.
For anyone who strives perfection in what he or she does, he/she must firstly enjoy what they are doing and only then that he/she can do that thing to the best of his/her ability and satisfaction. Same would be applicable to listening to music. One must really love the job of listening to music setting everything else aside failing which one cannot do the job to their best of his/her ability.
Another thing is, one must know the objective of the job at hand. One must know what is one expected to do. Citing my personal example, I was happily listening to and enjoying music for more than a decade on my Kenwood mini monitors, Denon Integrated and Sony CDP which are just budget gears. Though I used to read magazines like AV Max, Stereophile etc., I was not aware of the nuances of 'audiophilia' Only after joining HFV and going through the various discussions about sound that I realised what I was missing.
As far as my understanding goes, those who proclaim that they cannot perceive differences in in gears at different price points are most likely not into the hobby of listening to music seriously. Just my personal opinion so no flames please.