Agree, I have noticed that even the quiet time is still making a profit for the bots. And people jump on the wagon right at the last minute pushing ROI even further!
There are some steemians who took maths into their hands and made calculations on whether the bot is actually a profitable investment for your promotion and the answer was - no! You are better off without unless your goal is to promote. Other than that you collect the same profit! Of course, if the exchange is fluctuating you may end up in plus! :)
It is a shame not everyone using bidding know about this site.
If you have a really good post that deserves exposure I'd say take the risk!