I believe that there's more than one person who are working behind roobet until now.
Agree, because its impossible that a fast growing gambling site only has 1 or 2 person in it. As a former participant of the Roobet signature campaign, I am sure you will enjoy the game offered on this site and there is nothing wrong if you want to test it.
Anyway, the advantage is always on the house edge that is why roobet have more profit than the gamblers.
Gambling sites without a house edge may never last long without bankrupt because there are many cost that must be incurred by the site including taxes, site maintenance, campaign cost (if any) and You might have trouble finding a gambling site without a house edge, and right now you shouldnt have a problem with it and be a wise gambler using your money.
I haven't tried roobet yet and I don't know if roobet have invest in bankroll feature.
As already answered, Roobet doesnt have an investment bankroll.