There must be so much stuff just sat on eBay with ridiculous prices, because eBay actively pushes people into being lazy sellers, basically. eBay's algorithms apparently can't tell the difference between a mint condition bike and something like this, for starters.
As they are selling it for someone else, the laziness is more understandable, but still...a bit of common sense should tell you this isn’t worth £500...and maybe take more than one photo if you think it is worth that much.