Treehouse of Horror Ultimate Tapping Guide

Correct me if I'm wrong but even if I buy the hunting license to double the amount I can collect from my neighbors and visited my own Springfield 5 times a day to collect the aliens when they spawn that still leaves me short approximately 20 probes per day in pursuit of collecting all the prizes. It's imposdible to collect everything without spending money on this event. In recent events I was able to collect all the prizes and finish the event two weeks early without spending any donuts or playing five times a day. I'm all for making it harder so people don't finish two weeks early but let's not make it so hard that we have to spend every waking hour playing and on top of that spend donuts.