Years ago, a farmer near me was really into hifi. He had a huge record collection and around 15K-worth of gear, all with high secondhandvalue, probably about 10k. My gear was largely home-built for much, much less and we spent quite a bit of time listening to both systems
He died suddenly and later his brother asked me if I would like to buy his equipment. It was nice to be asked but I said I couldn't afford it - even if he sold it at less than the 10k market value to me, it was still well out of my reach. It turned out the brother didn't really believe my valuation and went on to sell it all to a complete stranger for a few hundred pounds!
Having had to sell my parents possessions after their death, I don't think there is any great problem with people putting out feelers about specialist items. I've had to deal with stuff whose value I knew nothing about at a time when there were all sorts of other obvious stresses of more importance to me. If a friend or colleague had come forward with an assessment of their worth, it would have been well-received by me and I would have been happy for the stuff to go cheap to someone who appreciated it, provided they used it and didn't just sell it on.