It's unlikely they killed your offers for hitting the two $5 royals ($20k each).
Casinos don't care about short-term luck.
They probably killed your offers because you weren't playing up to the standards they expected (compared to your play which earned the Platinum in the first place).
The only thing the two royals did was (probably) put you up lifetime there, which would remove any possible good graces the computer might have given you if you had run badly before that. You aren't usually punished for winning, offers-wise, but it does negate being rewarded for past losses.