I played close to 600 of $ BTC (not close to a good sample) for 4,37 ROI (49 evROI) and 328 cEV. All-in adj BB/100 was 3,84 and real bb/100 9,54
But they just felt unbeatable (see DougPolk twitter post about them). I had a good run and when the run turned I kinda gave up. I wouldn't mind trying them again because as you say, people play terrible at them. And they were great for raking in star coins