I personally don't believe in force feeding. Not every snake is meant to survive and I don't want to pollute my gene pool with weak feeders. As has already been pointed out, most healthy snakes will eat, so there is often more going on.

I should clarify that if a snake is sick and that's why its being force fed and that once it gets better it will eat, I'm ok with that. I won't force feed a snake that is other wise 100% healthy and refuses to eat.