I've not looked on the 'bay for several years, but this thread made me curious. I believe I bought most of my Minolta manual focus (MD) lenses in 2006/2007; now in 2010 in the aftermath (we hope) of one of the worst recessions in history, prices are higher. Weird. A quick check of closed auctions showed that all the most sought-after lenses are now wildly expensive and the decent lenses are all higher in price than 3-4 years ago.
In my acquisition phase I often purchased more than one of a particular lens so I could keep the best of them. It may be time to off-load the spares. Hmm, then I'd have more money to buy other goodies . . .