Because of the quite top heavy distribution of Steem Power support may come from a few large accounts. If you look at my stats, for example, it's quite clear. It would be far better to receive most of one's support from a large number of smaller accounts rather than a small number of large accounts, although both are just fine. It only takes one large account to stop upvoting you for your earnings to crater. That's why I very much welcome support from mid-tier account holders who regularly upvote my content. I assume these people want to support the author and the flow of content from his account rather than each peace individually. That's part of building a follower base. But opinions and preferences vary.