hey @decomoescibir,
you are partially right. Bid-bots are often not profitable. @smartmarket however is profitable and at least neutral. The biggest plus in any case, is however the visibility.
Votes shouldn't be bought for the profit, but to gain new readers and followers for your blog.
Thanks so much for your reply. Ill defintlly look into it, specially if you say its profitable...
Good luck!
D.