I came here to say exactly the same thing. If there's someone that have a bot that really works, he'll never sell it, because he can make free money by using it.

Also think this possible scenario: suppose that there is a bot that works ok. Everyone starts using it. Eventually it will start to fail because all the people would be doing the same movements.

A different scenario would be a customizable bot for a professional trader. But that's a complete different scenario because you'll have to set a lot of parameters to make it work and monitor it all the time.

So, try to develop your own bot (and never share it) or just trade by yourself.