I didn't see this post, as I have you on ignore. Someone alerted me to this post by you so I'm going to respond.
I asked David for his opinions when he first joined WBF. Just like I've asked opinions of many people on this forum; I like to solicit opinions from multiple people, including you. I don't glom onto one single guru as I believe ears are subjective.
Once I realized that all of David's advice seem to correlate with products he sold, it was obvious to me that he was just another dealer peddling his goods. Once he established himself on WBF and gained a willing set of disciples/customers, he started posting his political opinions on Covid, politics, and vaccines. Not for me.
You are not the first to put me on ignore. Frankly, I wish some others ignored my posts, instead of giggling and nipping at ankles. I am surprised to see you on a thread about David Karmeli's system. I suppose your friend can notify you of this response.
You can read in my two system threads about the four main influences on my audio pursuits. David is hardly a "single guru". I disagree with your characterization that David's advice seems to correlate with products he sells. Yes, he sells turntables and some vintage speakers. He is a dealer, as are many here and elsewhere. Like you seem to, I also appreciate the help of those who know more than I.
David helped me to completely alter the set up and resulting presentation of my old system, long before I bought anything from him. In fact, I approached him to see if he could locate and sell me a Micro Seiki SX 8000 II turntable. That resulted in an invitation to visit him. While there, he did not try to sell me anything. I asked him to sell me stuff. How ironic.
David offered to help me with aspects of my system which he does not sell. My entire electrical delivery and grounding system is the result of his free advice. David did not sell me any of my eight cartridges, any of my wires, or my rack and amp stands. In fact, we discussed their design as he developed his own rack system and we experimented concurrently and exchanged information. He has even recommended where and how to buy other electronics and speakers for a second system, none of which I would buy from him. One of the most valuable things I learned from David is cartridge set up, again, shared with me out of friendship during a visit to his home. David chooses whom to help and with whom he shares his experience and knowledge. We all do the same. Many enthusiasts around the world have benefitted from his generosity. He helped you for a while. At one time, you even acknowledged it to me. Anyway, you announced your return to the forum as you celebrated David's departure.