Really man? I think you're wrong! If you want to gamble, take the risks and always remember that when you go to the casino or online betting sites, remember that the HOUSE always RULES. You just had a bad karma that day because you still don't know how to play bustabit, and like you said, you did it for testing meaning you're new at bustabit, Give up now on gambling now man. :3
I know right. He is not even giving very good reasons. $500 to "test" noni don't buy that story. If you tests its more like $1 why do you need a lot to test you can even bet 10 bits at a time to test.
I'm not sure how fair it is though. I never really trust these sites fairness rating.
Main problem seems to be that a lot of people , and you likely are one of them, don't spend (I would better say "invest") some minutes of their lives in having a good read here on bitcointalk ( or even somewhere else) to understand how "provably fairness systems " work.
In this very same page user "Shogen" suggested one of it.
https://bitcointalk.org/index.php?topic=922898.0Suggest everyone, who still haven't , to have a look at it.
It's not a matter of "sites fairness rating", as you wrote, but you may just verify by yourself if a bet was manipulated or not.