It's a cash crop....with no jail time worries, unlike some that come to mind....
I don't expect to get rich, but I think it would be pretty cool to get the property taxes paid, the electric bills for the aeration taken care of for a year, and my fish food paid for. That much is very doable for a reasonable harvest, one that is manageable by one or two people. Might even be some left over for a rainy day.....