Mohegan ran better than average on that promo but they still got crushed pretty good. 800k is the number I heard that they lost. My estimate based on the number of APs there and the promo running for 24 hours was that they would lose about a million. Maybe some APs tapped out and some others didn't iron man the whole 24 hours which explains why they didn't lose so much. Or it could just be the rather substantial variance.
Anyways, my groups lost about 25-30k and we were over 100k below EV. Would have been nice to be on the other side of the bell curve for that one lol. We did have some trip bankroll issues at our lower points as we didn't really think it would last 24 hours so we didn't fly across the country with a quarter mill cash. We were able to keep playing but had to pass cash/chips around quite a bit when we were at our lower point. I also know of some other groups who lost, but like us, they didn't lose that huge, and I know one guy who won pretty big. Altogether I'd say the 20 or so APs that I know well enough to know their results broke even, but there were over 100 APs there altogether and I'm sure some of them got lucky. I think there's probably a couple groups who won well into six figures and just kep quiet about it (that's what I would have done too if I won huge). In fact, there could easily have been some solo players who won over 100k.
Lastly, the triple down does make it more volatile, but the bigger factor was that you were betting max almost 100% of the time (assuming you were well funded). This always seems to catch run of the mill card counters off guard as they are only used to betting max about 10% or the time. When you are flat betting max, you will go on some crazy wining and losing streaks. This effect is somewhat in play at very good count games, such as single deck dealt to the bottom where you have your max bet out maybe 40% of the time or 4 times as often as the typical shoe game.