Aren't whales more focused on gambling to get wins and lots of money because then whales can make more profits than chasing bonuses.
Bonuses are just a small thing for whales who gamble with large bets even whales will not think too much about bonuses when they are already in the casino, they will prefer to do research and look for profitable betting opportunities.
Maybe there are some whales who are looking for a bonus, but the bonus they are looking for is a bonus with a large nominal value which they can use as an additional bonus when betting.
But it sounds funny when whales chase bonuses because whales are synonymous with big money and when betting with bets that most other gamblers can't follow.
Depends on what kind of bonuses offered by the casinos, if the bonuses are quite attractive and big enough for the gamblers, whales will still care about it although it is not their main focus to get while gambling.
The most important thing, it is not recommended for any type of gamblers to chase for bonuses as it may lead them into worse result while chasing it and the bonuses will be something not worth.
Just like its name
bonus, it is just a benefit given by the casino for active players which is always better than no bonuses at all.