Even now every gambling site always offers bonuses so it is more attractive and when a large deposit the bonus will be given even greater, many compete like this but I think every gamble has a different offer and what gamblers want is always to make it easy for them.
Every new or old gambling site always offers its best offer so that it will be more and more interesting for gamblers to compete there.
The gambling site that give good bonus with less wagered requirements will be more competitive and attractive to gamblers. Fundamentally, the more they gamble to meet wagered requirements to claim bonus, the higher risks they will face with. But sure the gambling industry has been in its most active period recent years.
The old gambling sites release new games and many types of bonuses and at the same time more new gambling sites were born recent months too.
When you consistently pay up to bigger whales, you attract them easier, they usually do not win neither so what you are giving them is not really that big of a deal at the end. However this place already has rakeback doesn't it? I mean what else do they want?
I never really managed a casino before so I can't really know what a casino could pay or do to help the whales get here more often, usually on real casinos you give them high end luxury suits to stay, and even tickets to special shows and all that (free drinks and meal is usually for lower end gamblers but of course whales get that too) and even reservations on great food places too. But when it is online, all you can give back is money back, nothing else comes to my mind that would be helpful to attain more whales.