So you can verify your rolls, it doesn't mean it's 100% safe but at least random.
Safe from whose point of view? You the user? Or Doog the site administrator?
For you it's safe. It's showing that the rolls can not be manipulated in the sites favor.
For Doog, not as safe. If someone figured out their seed, they could in theory Clean house.
Except they can't figure out their seed. It is never 100% risk free for the user.
What are you getting at? I'm not sure if you're still misunderstanding things (like when you were talking about timing being important a few posts back) or not.
It's a gambling site, so of course it's not risk free for the play. They play exactly because they want risk. They risk some coins in the hope of winning more. If you remove 100% of the risk then it's not a gambling site any more. It's a paper wallet encased in concrete and buried in the forest.
So what's the risk you're not happy with?
Some I can think of:
1) you deposit, and I pretend you didn't
2) you withdraw, and I send it to the wrong address
3) I roll the wrong number to make you lose and hope you don't verify your rolls
4) I take the site down just as you're about to win big. "Sorry, we're closed"
5) I forcibly change your seeds "for technical reasons" just as you're about to win big
6) you ask to withdraw and I say "no, go away"
I would say that all of those are detectable. There's no way I can be sure to get away with any of them without people finding out.
Did I cover the risk you have in mind? Or is there more?