Ok simply then I have an i7-6700k with a GTX 780Ti, an old i5-430m laptop that overheats and has to be kept at 40% CPU, 2 raspberry Pis and 3 Android phones. All the kit except the RPis only runs about 12 hours a day!
The total power draw is 230 watts (measured from the wall) and I get 40 GRC per day, 20 from mining and 20 from staking, so that is $2.40 per day in total or $1.20 just from mining.
The reasons it's hard to pre estimate is because it's not hashes, you are doing real work, there is some variability. Project selection is critical to maximise earnings, you are awarded on your % share of work done in the projects you choose, so finding projects that suit your kit and that have the lowest competition is also critical. Also important is that the credit awarded is based on a recent weekly average, you need to run consistently for two weeks to start getting an idea of your output potential and ideally 4-6 weeks to get a really good idea of your total output.
So in summary from my bunch of CPUs I'm making 60 cents a day running 12 hours, and my GPU nets me another 60 cents a day.