Boni, actually, it's not advertised, but this site is also for those who are beneficiaries of large estates. Nothing under $1m. So, this is all of our way of letting loose a bit, since it's very taxing managing the accounts/holdings which support our leisurely lifestyle.
Some of the members of our illustrious club are quite modest. They don't list the actual components they own. You need to learn the code which will reveal the truth about their systems.
For instance, if an audiogon member lists his amp as a Rotel, you can be sure it is actually a Jeff Roland. Or, if you see a pair of Polk speakers, the owner actually has Wilson X2's. Owners will even post pictures of their lower class friend's systems or pics from ebay, so as to disguise their disgustingly ostentatious systems.
It's all a matter of discression and taste.
Oh, and watch out for the pretenders. When you do see a picture of a humongous system and specialty rooms, these are all rented spaces and equipment. They pay a fee to bring the equipment home, put up treatments, and set up the equipment so pictures can be taken. In this way it appears they have super-sytems. NO ONE really does that kind of thing in real life.