There was a HUGE argument about burning EDG by NPCs in another thread a while back. A very polarized set of opinions exists about the fairness of the GM burning what amounts to an unlimited pool of EDG among his unlimited NPCs.
Well it is similarly unfair to hobble the world around the runners by denying them the option... I've done it but VERY rarely... about the rate the PC's do it really and mostly to save their bacon, cause everyone loves their bacon... then again I suppose this was all very hashed on this "other thread" you speak of.
(Subsequent rant deleted due to lack of relevance to current thread)
I'm talking about tweeking the rules to make spirits DANGEROUS to summon... who the F*** summons something they have a spirit bane with in that situation? Edge spending is the default so we dial it up one more notch and here we are. In a place where you get 10 BP for being functionally unable to summon (EDIT: or Banish?) a class of spirit that also hates you and wants you to die.