It's probably the easiest and most rewarding job they'll ever have regardless of whether there's one person or a team of them behind the accounts, but it can be done just by one person if you think about it. Think of it as just like an admin job that you get to sit at home all day and get paid handsomely just for posting crap. If you look at their posts they're all just one/two liners with the minimal amount of effort being put into them. They find spam threads, write their one/two liners, then just re-write it over how ever many accounts they have. When you've got hundreds of accounts doing this the money starts to seriously rack up. Some users are making tens of thousands for this and I think some address have been traced that have had $100k+ worth of tokens sent to it so that just shows you how much money there is to be made for this abuse. It's why we need more than just one merit requirement and need to clamp down on the ICO campaigns who are paying them to make this rubbish because the worst abusers are just going to find ways to abuse the merit system to their advantage like this particular instance.