If you put a bowl out in front, in lieu of handing out the candy personally, what do you expect?
In the previous neighborhood I lived in, I more often than not would put out a bucket of candy and a sign for kids to take a few pieces but not to be “greedy.”
Every single time, there was candy left in the bucket at the end of the night. One time I overheard a father admonishing his child “Don’t be greedy.”