My favourite offers from Gumtree were
A Staffie cross pup for a Jinlun JL250-5 that I was asking £400 for.
A bodged GPZ305 for a working MOT'd ZZR I was asking £600 for.
The guy that wanted to send his "Agent" to collect the bike and deliver it to his super yacht next time it docked at Poole (bike was a £250 wreck), payment would be after loading at dock via western union.
And finally a dodgy sounding foreign guy that wanted me to ride the ZZR to a crappy part of London so he could give me double the price I was asking.
Listing on Gumtree is worth it for the amusement value.... though use a throwaway sim card.