I think it's that "per bin" price that makes American and teenage workers wince, they want to be paid by the hour, not by the product! :~D
I picked blueberries as a kid, we got paid by the bucket.
I was a clam digger in my teenage years I sold them by the pail or peck,or bushel basket the more I dug the more I made was making a little more than my father was on a good week. Times I wish I could go back to them times.