You'll notice my vote on this post is not as strong as it usually is. That's because, life has taken hold of my free time in a huge way. While I haven't delegated to a bidbot, I have used the delegation market in order to get a return on investment while I can't use my Steem power in my usual manual curation mode.
I feel like this "market" allows delegators to take advantage of delegatees, as unless you're really lucky, or good! (Or front run bid bots) it is hard to get genuine bang for buck in curation awards, based on the increasing effort to filter through shitposts (like this one) to get to the real gold.
JK about this being a shitpost.
haha :D
Times are tough at the moment, and I suspect even the bot income isn't exactly saving you on it's own.
The delegation market, if going to a good source (are they curating? probably not) is reasonable. There is money to be made setting some well timed up-votes, although admittedly, not the same ROI by a distance.