We all know that something is only worth what someone else will pay for it. Some call it the "greater fool theory." I have seen these prices before. Despite that, I sold my Mobile Fidelity albums at $50 each (many were still sealed). I had only paid $13.99 for each. The only exception was the 5-record Woodstock boxed set, probably very rare, that went for $200. I was happy to make a profit.
Old School MFSL
For fans of the older Mobile Fidelity stuff: http://www.elusivedisc.com/MFSL-Sealed-Vinyl-Rare-Out-Of-Print/products/3121/1/0 One of my favorite labels, back in the 80's. I've been a happy customer of Elusive Disc, for over a decade(no other connection).