We used to make about 50 gallons of maple syrup per year. But some people in our area make hundreds and even a few thousand gallons! That is the amount of syrup, not the sap. So some of us even sell it.
There are several grades of maple syrup. The higher grades are, of course, for putting on pancakes, etc… But there’s a grade “B” at the low end of the scale that doesn’t have a very good flavor, but still has the sweetness. Our equipment supplier buys it at a moderate price and resells it in bulk for use in making barbeque sauce.