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It is not possible to identify one bot to be profitable as its ratio keeps on changing every time. One bot is profitable on one turn in the next turn it may end up in loss. Let’s assume a bot is giving upvote worth 1$ if it receives 2 bid of .1 $ each its vote will be distributed in the both bid in ration of .5$ each and both will end up in profitable. In the next round upvote worth is the same but if it receives bids valuing 1$ or more in next the bot will become in loss.

Considering above I will see which bot or bots are giving best profits in the round and will invest accordingly in two three or more bots. 

bosster

Boomerang

Ramta

Rocky1

no.....he need 3 steem but i say only 0.001 to 0.005

For new user I highly suggest not to use any bidbots at all. 

Sure it will be disappointing seeing your blog posts that you have worked for hours earning only below a dollar. But using bidbots discourage most curators to upvote your post. Their reasoning is mostly: "If you can afford to buy the vote, then you don't need the vote."

But to answer your question, there are only a few bots that accept below 1 Steem as payment. @drotto, @banjo are the famous bots I know of that accept within that range. You can however check the list of the most famous bidbots on Steembottracker:

https://steembottracker.com/

Make sure to scroll down at the very end to see bidbots that are within that range.

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