I totally agree, the fake bidders were a huge problem and this is - as you said - reflected in the popsike results. However, the fake bidder phenomenon has somehow vanished in the last year or so. Besides, the prices of the really rare stuff (especially in Rock Steady and Ska) has sometimes tripled over the last few years, and that without the fake bidders. So, in the end, it really depends.
In this particular case - the price stated by John is reasonable.