Re:
Got to agree with some of the previous posters. There are a lot of fans of JMC, but probably not too many with even the price of a £25 raffle ticket easily to hand, never mind £5.1K - even if their better halfs would let them buy it.
Have you considered just relisting it on eBay? If you can drum up a bit of interest on forums like this it might achieve it's previous price or more (or it might not). In any case, you'll likely find it's true market price - and also probably quicker than any other route. I guess the fear is that it's current market price might be considerably lower. Not everything appreciates in value unfortunately, and there can be peaks and troughs as well.
I guess if I was buying something like this, and looking for a return I might take it to the various gatherings and events and perhaps charge people a few quid to give it quick ride/get their photo taken with it.