Every time I think about deleting/completely rehauling a mediocre old fic of mine, I think about all of the mediocre fic that I love and reread as a guilty pleasure and stay my hand. I'm enough of a non-entity that it wouldn't make a difference to orphan it - I would know that it was still out there, accumulating lots of kudos (it was a futurefic for a popular thing with a small fandom that ends on a cliffhanger, so this is sadly inevitable).