If your goal is to profit from bid bots then that will take some trial and error with some luck mixed in. Steem Power can be powered down and thus turned into Steem. Personally I don't use bots nearly as much as I use to as my main focus has switched to Tribe Tokens and advertising my content on said sites.

If you don't know what tribe sites are, they're basically clones of Steemit that award alt coins. These coins can then be traded / sold on the Steem-Engine exchange.

Content creation rewards are split 50/50 (Author gets 50% of and upvoters get the other 50%) . Which makes it harder to profit from bots.

If you are using strictly for advertising purposes and less focused on earning a profit from them, they do work in the sense that they get more eyes on your content.