A casino that houses about 200k users online any time of day and with a mere 100 personels working as their vip host, it automatically means that the vip hosts will become like expensive commodity that only those with lots of money can afford for as long as they want because there is a lot of people to serve..
Visitors will increase on weekends (Saturday-Sunday) but on normal days there are an average of 50k-90k online users, besides we don't know if they count 1 user who opens 2 pages (Casino and Sports) but yeah still fantastic visitor. From so many users can we assume how many total users with Platinum IV? this is the requirement to have a VIP Host, in the chat room less than 100 Platinum IV are active every day but yeah I know many of them not use chat rooms/silent player so don't think VIP host handles more than 10k users.
If you think Platinum IV will increase every year then what you think could be right VIP Host will be more expensive may need Diamond Level to get VIP Host, they had already made this change a few years ago.