First of all, we play to have fun. I assume, that everyone can judge what is heavy/abuseing bless and what is not. If Van playes W9F9, that that is very heavy bless, and will not be allowed. In the other hand W9B4 for Mictland is more acceptable I think. Long story short: please use common sense in pretender creation.
No, it is not, but if many players with VP, then VP shall be.