How much time does it take to manage? I can't imagine it's too demanding if the lists are user-generated. I say keep it...it could be that if the site gets a food sized following, you might be able to make a fair amount from advertising. I have a friend who runs a site with scraped news articles and a forum, and he's making $80K a year on ads alone. Of course it took 10 years to get to that point, but he didn't have to touch the site more than an hour or two each month.