The VIP Area should be expanded in my opinion. This could be done in the following way:
More monster spawns, as the current ones are not really that good and is indifferent from the normal spawns. VIP should give you somewhat an advangate over the normal players. I dont mean double exp speed, but atleast a lil' bit better.
Also you should try to add some nice features for the VIP area, like blessings that only those who've got access to VIP Island is able to get.
Those are just a few considerations, and I hope that you take 'em in mind.