I try and be healthily sceptical about most things. There are lots of audiophiles who are neurotic about missing out and, excluding those for whom money is not a concern, one of the biggest issues is whether they can afford the next best thing. I was looking at a streamer and the online manual said to connect it
"with the best cable you can afford". The problem is, whilst not especially wealthy, I could have afforded a cable that cost 10 times the price of the streamer. So do I spend $20k on an HDMI cable for a $2k streamer? Plus we have better things to spend money on. We like ceramics and last week bought a piece from South Korea that cost as much as our Wilson speakers, the difference being the ceramics is a good investment.
Living in a large city with lots of audio dealers and plenty of invites to demonstrations, there is no difficulty hearing as many systems as I want, at any price. I learned a long time ago that there are hugely expensive systems that I personally hated, for example one based around Magico M3 and Naim Statement, but other people loved it. I love Quad electrostatics and related Quad equipment. They sound real to me like no other speakers. I bought a pair and my wife told me to get rid of them, so I did and next time let her choose the speakers.
Fuses? An interesting product because there are so many lies and misinformation about them. Hardly surprising if you can take a $0.30 product, relabel it and sell if for $10,000.
https://www.futureshop.co.uk/quantum-science-audio-gold-extreme-level-uk-mains-fuse
I did try a couple, but I can't say they made a difference. Apparently it's because my hifi system isn't good enough. Or I used the wrong brand. Who knows.
For whatever reasons, here in the UK equipment is often supplied on a home loan, so there is no expectation bias. Not just from local dealers, also dealers who have to send by courier. I asked Lanedri for a loan, but he wouldn't do it. A sale and return would cost me 23% import duty and tax, plus shipping. The Muon guy said he didn't have loan items, then changed his mind, and I will take him up on the offer in a month or two, when it suits him.