well, it's like when you see imperfections on your skin (acne, scabs, etc.) and you just constantly scratch and pick at it, with either nails, a pencil, whatever, until it either opens up or bleeds. i do it because it's a bad habit of mine that's hard to break.
I just felt a bit overwhelmed and self-concious about the site, (feeling that way about a lot of things lately), I'll probably get back into it soon enough though.