I don't believe on this, because to start a gambling business, you need money to do so, not only that, there is need for another backup fund to maintain it running's, same will it be when you first started and the first sets of gamblers that bet won and you have nothing to do than to pay them, even though for the advanced ones, they might have enough money that they keep in rotating within the gamblers fund for those that win with those that are loosing.
I may not know much on these since am not a sportsbook operator neither have i participated in any, but we all work by what the people are saying regarding it, only the experienced ones should have something to say regarding this.
I may go with this by saying yes, they try to set a limit in other for them to restrict the gambler from going beyond their budget.