My gumtree experiences (not just with cars) is frustrating at times - some folk are downright rude, like if selling something for say £250, the first message was just a number, and one which is/was nowhere near the advertised price, such as "100".
I got to the stage of replying with "100 what?"
My take on this is that there's the faceless element which makes it easier to make a cheeky offer in an unpleasant and downright lazy fashion, and not be on the end of verbal abuse or a punch on the nose
I sold our old trusty Volvo Estate a few years ago via Gummers and it was laughable some of the messages I received.
Further up the tree it's definitely a crap time to sell - I didn't get any real bites with the Cerbera, but then I wasn't desperate to sell and therefore didn't stoop to some of the silly offers received.
At the end of the day, buying/selling is all about how keen you are to buy or sell, and where your financial limits lie
That's said, if anyone fancies a healthy yellow TVR I'll possibly be advertising early spring

- time to eventually scratch the quarter-century lotus itch
