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Wouldn't you "want" their upvotes then? Or do they stick to themselves?
I mean, wouldn't they be helpful to have as a follower?

It's like anything...some of them are heavily involved, other are taking a hiatus and have delegated their voting power to other users, and some are basically ghosts. Their downvotes are perhaps more influential than their upvotes, so they can be really useful in keeping the platform free of spam and plagiarism. I'm sure that plenty of people have invested in steem power for that reason alone. It's kind of nice having a social media platform where people care that much about maintaining some modicum of quality in the feed.