This is just one of those "random" thoughts I had that got pushed a bit further after looking at the demo function.
I have an idea for an item that would produce a random effect, such as decreasing or increasing the consumer's post count, decreasing or increasing a target user's post count or money, or removing all of the consumer's money (rare case, but this would also include the bank if enabled)
and also while it's fresh on my mind, ZiNgA, I think you left a trivial typo in your "simple demo module" comments:
(personally, I would rephrase the line in question as "remove all items we added using _activate() with the _deactivate() function")