Good idea and provably gamblers love that but for casino owners it's not ideal thing to do with them since it's a profit already for them so it's not totally ideal to lose a profit for just giving it back although it's good promotion but still it will not justify the expenses to run a casino. Maybe they should focus on doing such good promotion instead of doing that.
provably fair games and maybe third party casino and table games would be much better some people would like to place in live casinos where some prefer provably fair games. Adding variety of gambling games would really could gather players from website.