I happen to enjoy the content itself, even if it's all just riffing on the joke on the headline. But I'm a big fan of snark in general.
Also, I'm not 100% sure, but perhaps there are some SEO boosts from having long form article content that wouldn't be gained from just having a title and a blurb (though they do also do those very short form articles as well, where it's a few sentences with the headline)
I think the de facto purpose of the article text when shared online is to make it more plausible to someone who doesn't know the site is parody.