What kills me is they're so in love with their beliefs that they're engaging in an active denial of reality. You just did the blind test and did no better than chance. Clearly these doodads and esoteric cables have no effect that you can discern one way or the other. That's the reality.
DENIED!
That's just human nature. Ever talk to a golfer who just bought new clubs?
Someone who worked for the same company I did announced that his old clubs were for sale when we were at a manager's meeting. I asked what they were and how much and he said they were some Titleist model, asking $900. I asked about his handicap and when he told me it was 22, I told him "Take some lessons- it's not the clubs". A friend from high school apparently can't putt to save his life, so he buys a lot of putters. Must have 50 in the stand he keeps in the basement. One of my customers has sets of clubs in his basement- I didn't count, but there must be close to a dozen sets and I found another behind a drain pipe on a shelf yesterday when I was organizing some cables. His golf pro must love that.
I bought my clubs in 1979 and I still like them. I have hit great shots, good shots and crap shots but the only thing that changes is my swing or rarely, the grips. My putter is probably 40 years old and it's the same story but I have had far more problems with that than the other clubs. Again, I changed something about my putting grip, stance or stroke and it made the difference.