“But none of that makes me believe he was actually betting $1 million a night.”
I’d be more interested to see his average nightly winnings/losses. The casinos, I’m sure, have this on a nice little spreadsheet but I doubt we’ll ever see that.
Casinos are businesses, and they are not above running off people who win consistently over time. At the very least, he would not be getting comps if he was winning significant amounts on an ongoing basis.
If he was breaking even, or losing a small amount on average over time, he might be tolerated on a cash flow or “the house will win in the end” basis.