well it varies day by day because we don't know how many user win and losses, still in the long run, gambling site will always win but you will need to find one with good trust and proven fair else its mostly scam
Ya make sure we check the background of the gambling site we wan to invest.This is because some site got hacked when the they already have a huge amount of margin from investor.Maybe the real hacker or maybe the owner of the site opening a loophole and claiming the site was hacked.
In this forum, you can find a good casino who accepts a bankroll investments and one of then is crypto-games. But you should know that sometimes you may lose money if anyone wins big amount and that's why you shouldn't put all your money in a single casino site. If you diversify then you can make a good profit in the long run.
This is always part of the risk when we decide on investing on gambling site bankroll which theres always a possibility that we would able to get nothing on a month if there are lucky fellas did able to win big which makes the profits of the site turns out to be negative.Investing on gambling site bankrolls isn't a bad idea but don't expect too much that returns would really big just like on other investment but somehow safer and less riskier compared on others.