I have to give kudos to Captaincooks as they’ve managed to keep me some decent sized players for nearly 5 years now, steadily every months; even though I haven’t sent them traffic for about 2 years. I also had 1 whale with Riverbelle awhile ago. Earned me a few grand consistently for about 5 months.
Now I know this might be an unpopular comment to some of you but surprisingly Casinoblasters has been one of the worst in terms of player retention from my experience. I would get a few decent players for 1 month and then they all vanish and never come back again.