I did this once before, when I could well afford the loss of income and I'd been bullied and couldn't manage or wait to find a new job first. Have been considering it again recently, which I won't go into now but just realised others must do the same.
I know we are all replaceable but I think we reach the point when we like the thought of making it difficult for certain people, ( not necessarily all) those remaining in post when we go. What were your circumstances when you left and you knew it would cause major inconvenience?