@nandric
It is very simple.
Audiogon provides an excellent forum for audiophiles to discuss and debate all things audio. The issue is that Audiogon can only exist if funding permits, and I assume that some of their funding comes from sales commissions.
If you take a helicopter view, then Audiogon has saved a lot of readers a lot money through access to excellent advice. Therefore is it too much to ask for Forum members to give a little back ?