Frankly, I always maximize the worship rolls with max MPs. But I don't think things becomes too easy:
- The gods need the MP.
- If you spend too much MP, this is spot on time for the GM to launch something. If you are left to 1MP and a band of broo attacks the village, or someone needs an immediate help for healing, you are in deep sh..., not to say that using sword trance with 1 or 2 MP (the ones you have recovered) is a bit futile.
- I think you forget the other modifiers the GM may add (weather, omens, whatever he wants), that may force you to use the other options to get a d