Here's the problem:
Even if the majority of the investor funds are held by a 100% trustworthy and secure third party, there's no waythat I can think of to stop the site's owner from playing his own game and slowly winning all the coins. Especially for a game like moneypot where the crash point has to be known by the server before the players finish acting.
So is it really worth insisting that the funds are held by a third party when it really doesn't protect the investors anyway?
Edit: one thing that is worth noting: from what I've heard, the plan is to allow investors to only actually deposit a fraction of the amount they want to risk. So you'll be able to say "I have 100 BTC and want to risk 1% of it per game; here's 10 BTC of it for now". So if they do run off, they only get 10 BTC not your full 100, but you'll get profit (or loss) as if you had invested the full 100 BTC.
This is a potential solution to hedge your 'investment' from some of the risk of investing, but at this point, god speed to anyone who wants the risk of trusting any of these sites anymore with loads of your coins. Site operator knows the crash point of how many games in advance? He can run a dozen bot accounts that slowly drain investment by winning without making it obvious he's doing that. I'm starting to wonder why anyone- with how many times this community has been burned- would put themselves at risk anymore. How many times will it take?