I buy what I like. I don't need to eat it, but I usually only get 3 or 4 trick or treaters anyway. I put the bowl on the porch, because I'm usually not at home. If I was that first kid, I'd dump the entire bowl in my bag
I guess I'd rather have a bowl of things I like then having to throw it out.
Besides if you don't want your house tp'd you'd better have the goods