I always find selling on Gumtree a major hassle. Probably because I tend to use it for work related stuff rather than second hand wallpaper, so there's a lot of fat builder types who are functionally illiterate and very few (so few, in fact, that there are none) MILFs who get in touch about ads I post.
So many timewasters too. Not people at the wind up per se, but hopeless morons who waste time with a series of inane and illegible questions and are just generally pests.