Everybody gets the chance to reject wish automatically. Nobody in Dresden Files worth using it on, is dumb enough to think random wish out of nowhere is a good idea. Even after that it only a Perception + Awareness D8 roll to realize the price, pretty much anybody above pure mooks can make that. Also dropping 5 essense on anybody puts us in danger can be killed mode so their is that to.
That's why you stack the deck and weaken the opponent first, so that they fail the rolls.
Artemis is right:
I'm pretty sure the real point of VEE was always to make people owe you.
It's a Cecelyne cult-building Charm.
It's a cult building charm, the effect after three years is too slow and weak to be the main point, the interest is all that's before. It isn't there to give you an army of strong mooks, one dot is not enough for that, it's there to make people pray towards you and strike bargains.