For some reason the thrill of owning and listening to the really nice stuff always seems to fade for me. I start thinking, "I paid $5k for this amp and is it making my listening any more satisfying?" My answer has always been "no, not really." The expensive stuff get's sold, and lately not through Audiogon.
What has been satisfying is finding pieces which offer equal (to my ear) sonic pleasure at a fraction of the price. Building Bottlehead kits comes immediately to mind. Or my latest project, finding a non-working Hafler amp and bringing new life to it with modifications.
As I said, my stuff doesn't get sold through Agon anymore; they lost me during the big shake up a few years ago. Seemed like every time I went to list an item here the fee structure was different and there were other alternatives which worked just as well for me. When I joined this site, placing ads cost $2 it might've been $1 but my memory is fuzzy. It was a wonderful site for hobbyists. As with everything in life though, it changed.