VIP subscription never works well. If bonuses are purely cosmetic, and small, it's not worth it for people to dish out money for it.
If bonuses are tangible so it becomes worth it to people to actually subscribe then lots of other people see it as P2W and you lose a good bulk of your player base.
Either way, VIP subscription only works for those games that already go as P2W, and then this is implemented as just another P2W boost.
VIP subscription will, in my opinion, not work in a game that is trying to not be P2W.
(a boost, no matter how small, is still a boost, and a portion of people would be lost due to that for sure)