I have two comments.

1) in my opinion the prices of campagnolo have gone down compared to 2006/7 highs. I bought in at the time and you could not get a nuovo record rear derailleur for under $80 or a front for under $40.. well you could but it took a lot of time and patience. Maybe prices tanked again in 2008 and have been slowly recovering since. I did a big sell off in early 2008 when prices were still decent. I also paid $100 for a used super record rear mech in 2008, because I wanted one in better condition than the perfectly functional one I had, no way I would do it now!

2) The prices of suntour and vintage japanese have gone way up. In 2006 I bough a nishiki Comp II on ebay for about $300 shipped with cyclone, super mighty, gran compe, cinelli etc... not a chance I would get it that cheep now. Back then, no one was paying good money for vintage japanese. I had to sell a black 1st gen dura-ace/crane derailleur and shifter set in excellent condition for $40. No body wanted it. Yet I could sell a beat up campy front derailleur for the same price.

frames might be a different story.