This indicator is far more important than the number of followers. This figure can not be purchased. It's like the honor of an account.

It can be purchased and routinely is. There is a lot of vote buying on Steem. Vote selling is done by accounts that have massive amounts of SP and often high reputations. Reputation is earned by getting upvotes from higher reputation score accounts. Many bidbot accounts have high reputation scores. For example, @minnowsupport has a reputation score of 68.