Graham,
Have you thought about adding another section in the Marketplace for free stuff. I’m pretty sure there’s plenty of decent blokes here that are happy to give surplus bike parts and associated paraphernalia away to a good home in the of interest the sport and sharing the love.
Not everyone needs or wants to get the highest price they can for junk that won’t sell on the open market. So why not “Free-cycle” things you don’t need that others may benefit from to get a bike up and running.
What goes round does comes round, and it might also open up the swap and barter scene on the forum, a very decent way of doing business.
Just a thought
JJ