I am not sure how true that is but it can be that there are not enough whales supporting art at the moment. I see that it is quite a small circle of them who are around and supporting. I remember having read somewhere it had something to do with the current "low" value of Steem. Also the curve seems so steep to have powerfull votes so there's some kind of ditch in between. Expecially since there's also a lot of new users.