We already know this answer to this one, since gambling is all about luck it makes no sense to keep trying your luck on one casino when you can do same with two casinos, either with higher VIP rank or not you will still lose and the game of luck is still running either ways so..

I have tried using more than one online casinos before just to see how it plays out and the experience is not much of a difference but it's still better, I took this route because I gamble for two weeks straight on a single casino and I got nothing, I kept losing over and over again, but when I try another it's not the same.

This is why I think it's better to use more than one online casino to try your luck, it sometimes make sense.