I don't think this is really true. I've been invested in a few casinos bankrolls, and they've all so far been profitable (*touch wood*), just the main problem has been most of them having pretty low bankroll turn over.
And correct me if I'm wrong, but crypto-games seems to fall into this category for me a bit. I believe bitcoin investors made 52 bitcoin in the last 6 months (which is absolutely nothing to complain about) but in the same period bustadice investors made 479 BTC (and based on a smaller bankroll in fact too) and bustabit investors made 1250 (although ~750 is probably a better number due to some huge whale action that happened exactly 6 months ago today).
But anyway, I agree with the rest of the stuff said here. Probably the thing I appreciate the most about crypto-games is how this thread is kept non-self-moderated so it's pretty easy to check in and get the full story of what's going on (without worrying they're being deleted) and in over a year of following it, it seems like a very honestly run business.
You forgot to count altcoins into equation. For example, investors profited in last six months 3846 Ether (160 Btc) as well, then there are other coins, while busta* sites have only BTC bankroll.
Here's seperated investment thread on CG from Lutpin and is updated once per month: https://bitcointalk.org/index.php?topic=2445163.0;all
Anyway thanks for compliments, I must admit that both busta sites are pretty awesome.