I'm using $25-30 to buy upvotes for every post and getting payout around the same amount + some SP and I think this system is useful for platform, especially for minnows, since whales and dolphins has much more ways for promotion.
Also, let's not forget that main vote sellers like @minnowbooster and @smartsteem has limits and they use rating systems, so that they won't upvote shitposts. Maybe someone will use bidbots to make money on a low-quality post, but leaving spammy comments under everyone's posts in a row is not a solution. In my opinion this bot is not more useful then bot posting BTC price.
And I still havn't got an answer, why does this bot need SP? What it will be used for? It's not supporting minnows or quality posts, it's just leaving comments. If I'm not wrong no SP needed to post a comment.