It was hard at first to come up with ideas on what to write about. And I wasn't really seeing steady income from it so I didn't have as much initiative to write every day or even every week.
I'd get my thoughts out there and then move onto something else and not write again for months. But once you write more often and browse the site you'll become a part of the community and see that it's not just about the money and you'll never run out of ideas on things to write about. I mean you can browse the answer section and get ideas.
And yes, some people do have more than one account but from what I've seen it's usually people who want to hide what they're writing about and how much traffic and money they are making. They'll have one account full of their writing and another account that they just use to comment with, talk in forums and so on. That way they can disclose traffic stats, earnings and so on and no one knows what they're writing about to get those stats... I guess they just want a little privacy and don't want people copying them and flooding their niche.
Hope that helps!