But for people who don't want to cheat the system, they will report it to the casino that many people do cheating.
That will depend on each people what they want to do with that and if they think cheating is a bad thing, they will not follow others instead will play as usual.
It's like a mission impossible if don't have a benefit to it. I often find the casino just says thanks if someone finds a vulnerable system on their gambling site. Even if it is very important, the casino doesn't give him any reward or maybe a free bet or something. I think the casino management should think about this. Apart to find out the vulnerabilities, the bounty bug program and review site are good for getting many customers also. The casino must open to any report and must give the prize if someone finds the vulnerability system.
I doubt any casino would reward you for finding out an issue with their operating system that can be exploited by their customers but some casino do give out bonuses on review program carried out on their site and a couple of them are already using this strategy as you have already stated that its also a means of acquiring more customers to the website. Megapari just hosted something similar to this and I know this will indeed attract a lot of new gamblers to the website.