Abusing the bonuses and promotions will have a huge consequences and I'm confident that in Roobet it is being monitored so better not to try at all or else you'll face bigger problem especially if you have funds on Roobet, it might get locked. Bonuses and promotions is not that big, and also it requires huge money to qualify so I don't see a reason to abuse it, that's more of being greedy to me without thinking properly, such a shame.
Unfortunately abusing will not end, even if you have punishments for it. For nearly a decade now since satoshidice started, we have seen people who tried to abuse it constantly. I have seen it when bitcoin was under 100 dollars, now it is even more rampant since the price is higher.
Even double spenders who end up using a million accounts have been doing the same thing, double spend a deposit, wager, if you lose then go with other spending so that you never really deposited anything, then you could keep doing it until you win and if you end up winning then withdraw the money and 90%+ of the time get caught and banned. They keep doing this, been so many years, rarely they succeed but they still try because it is not difficult, and preventing just means "credited after 1 confirmation" and it's done. Abusing a casino will never end, it is just way of people think, and I know how horrible it is and yet some people are still doing it for some reason.