I really do feel you bro but the truth is that those posts that do really well without them would have done even better with them.
I know one shouldn't be only focused on making money here but that's important as well.
I also know there are different feelings about using bots but I'd recommend you use them if:
You want the post in question to have more publicity.
You want to boost your earnings on the particular post.
If you really understand when to bid and which bot to use at the time in question. Many people use bots at random and haven't understood how to use them profitably