ok

I'm not a horrible person lol, I freely give away any information I have on here.
But you know sometimes, when it's high values at stake, the knowledge accumulated is very costly. I only do this as a hobby and for love but even my meagre selection of books has probably cost me the best part of $1500. And that's never mind the time I put into reading them. And I don't visit museums or own enormous amounts of high end glass to accumulate knowledge, and that all costs .
Therefore I can understand someone not wanting to 'give it away' freely. That person is trying to sell his stock. Why should he give a potential competitor information I suppose?
Equally I also understand the importance of marketing and good word of mouth

sometimes one good deed can turn into a gigantic sale I'm sure.
I'm not really disagreeing with the heart of your message. But perhaps there is also another side to things as wel?, there's a balance, he probably gets contacted weekly if not daily, asking if the owner's piece is real or fake if you see what I mean.
m