I only know why one person is selling his Extreme Platinum, and it's for needed money. Since this is a hobby, I think some people find if he or she suddenly needs cash (I've seen school, new computer, unplanned car repairs, remodeling house, etc), I think it's easier to let go of an amp, headphones, or rarely used source and assuming another one will always be available later rather than dip into the bank account or find something else to sell that won't have the same resale value.
Regarding FOTM, I'm not sure how true that holds for more expensive things. I'm willing to be wrong (and often am
), but I can't see dropping the money for an Extreme, Apache, B52, Zana Deux, HeadRoom balanced desktop or any other of the really great $1000+ amps that recently came out without having heard it first or having had prior experience with other amps from the respective builders. It's a little different than trying out a $100-$500 headphone or amp you haven't heard then turning it over for the next one you think you might like better.
I bought my Extreme Platinum (I don't think there was a Platinum at the time) one day after hearing it last December when it debuted at the Florida meet. Athough I'd just bought a Darkvoice and a Canamp (FOTMs...I've kept the Canamp, which is currently being modded), I suddendly heard how a great amp, as opposed to a good amp, could change my listening experience (e.g., eliminate the veil from my beloved HD650s, listen at low levels without loss of quality, etc). Since then, the upgrade bug bit, but I've been able to stick with the Extreme. First, I had blackgate outs added. Then I bought an F1 to drive my Abbys and K1000s, so I had preamp outs added and a secondary power supply (though I didn't ask for the latter, it was a real nice surprise with sq improvements). If I want to change things up some more, I just try out new tubes. I guess what I'm saying is that I don't think people are dropping Extremes in the FS forum for FOTM reasons....you can just change the flavor