We actually don't know who has the multiple accounts even some of the veterans used to cheats with multiple accounts for years on signature campaign so its certainly for the money making intention nothing else but there are some exceptions like who banned for excessive trolling or something but they are keep coming with new because they can't stop being a stupid.
That's one of the reasons why other people creating new accounts or let say smurf accounts to participate in multiple signatures campaign in order to make a money. Not just in signatures campaign but also in other bounties. Like what was said above there are many users here in forum has a thousands of post but still newbies cause they are came here for money not for knowledge.