High(er) profile than previous, more buyers and despite the economy, you always get one with a stack of cash that they don't mind spending.
It just takes one £200 bike to go for £500 and then everyone else uses that as a template/expectation for their sale. People can be willing to wait for a long time to secure the deal and that just increases the chance of a big money sale.
I also learnt very quickly in my first retrobike experience that refurbishing stuff properly costs so so much money I've had a total turn around, I would now pay serious money for something that is really 'mint' and is ready to ride.
I have heard this - somebody just discovering the bike from the long, lost halycon days, willing to spend truly top dollar on a replacement. Now I'm not saying it never truly materialises - I'm sure there's the odd case where it has - but it's not the norm - and many just seem willing to say what they'd be willing to spend, but I rarely see it happen on bikes for sale that are truly priced, well, somewhat optimistically.
And seventeenthly, if such does truly happen, and somebody does buy at a high price, because it means so much to them, that doesn't necessarily change the market. Somebody else selling, may see it, and think they can capitalise - but if the previous instance was a one-off, effectively because of emotional draw and being blind to norms, doesn't mean to say that any other remaining buyers would be prepared to splurge.
Yes, on occasion, people often pay much more than the "going rate", but it's also rare for that to have any notable effect on the "going rate".