Because as we have already discussed the fact that all scammed people are outside of this forum. Noone (from old users, who have money to gamble) on this forum is using their services.
Or, at least, their efficiency is too low for such amount of paid sig spammers (this is like 100 % I think)
All scammed victims are definitely not from outside the forum. Majority of them are, but minority are forum members who most probably aren't coming forward in order to avoid humiliation which makes sense.
I guess it's because the site can use a lot of money as a tool to promote on multiple sites. And people out there don't or don't know that the site is not a casino site recommended by us and they easily play gambling and spend their money there. But after they got the win, they had a hard time withdrawing the winning money and ended up getting into trouble and then they complained here. If they could research before deciding to deposit their funds, they would not be in that problem and could also choose another casino site.