I think it's when people want to leave because of dissatisfaction with the Forum/members for one reason or another and they want everyone to know they're cross!
Totally agree Pedantic, and they want everyone to say 'please stay, we love you'!!
Attention seekers. If you don't like it somewhere, stop going there! Works in life as well as tinternet
I think some do it because they have perhaps said a little too much about something or someone or may of told a porky or too and then realise they will be caught out because you never know who's lurking
I think its because, they tried boycotting it, maybe kept having a little peek and eventually it got the better of them and had to post after they promised themselves they wouldnt, so deleting it makes it more final.......
No sorry totally agree with spitting the dummy out.