I'll try to enter just because it looks fun! Don't really expect anything to come out of it, since I have no experience making comics, but I've always wanted to try so I'm using this as my excuse, haha.
Whether it's worth it depends on what you're looking to gain from the experience. Do you want the big prize, to get some practice, or is it just for fun? From what I've seen, at the very least you can get some more eyes on your work when you enter contests, so there's that. It also depends on how much work you're putting into it. And apparently this is the second time the contest is being done, according to what I saw on CSP.