THIS.
Seriously, once you manage to accumulate enough refills for your patches to last through the event, what good are the refills? I can see a market for them early on, but then I see that market going south FAST as the number of people who have enough refills increases.
Also, as the end of the event approaches, what good is a refill at all? If a patch can't convert it into a pumpkin, it's pretty useless. This sort of ruins the opportunity for 11th hour premium runs to gather enough for a certain reward.
All in all, I like the idea of the refills but either I am missing something or the end of the event is gonna be a big letdown.