Actually that "5 figure" seems like a typo..
* the cold storage is just 3 figures not 5 figures ( sorry my mistake i typed the wrong number )
Even if you have 999 coins, you can def. not offer "no maximum bet". Just-Dice used to have 100-200 coin bets like it was no big deal and even 20-30 coin bets would be too risky. But let's wait for the cold storage wallet and we can consider it from there.
For your points 1-2-3 i don't see any problems
I didn't mean to say that the first 3 points were bad. I meant to say that they do not seem to be consistent with using a script that has many accusations of backdoors in it. In my estimation someone with decent money would in fact make their own script from scratch (with some trusted opensource frameworks) or at least not base their site on -that- script. But if you do feel comfortable using that script, that's your choice I guess.
about your last point ( which we claim to have a fantastic provably fair method )
yes we have the best provably fair method
As emphasized by dooglus, this is absolutely not true. Your lack of knowledge about the provably fair mechanism is slightly concerning.
edit: I thought they had a max of 20 coin bets, but actually they have no limit in max bet - which is rather impossible "even" with a 3 figure bankroll.