Walnuts are expensive, but do black walnuts taste different than the generic walnuts for sale? If not, I'd be tempted to spend some time harvesting some of them for personal use.
Yes, they do taste different, much stronger and often bitter to my tastes. I think the secret to making them enjoyable is a long drying process which allows them to mellow a bit.
"Things should be made as simple as possible, but not one bit simpler." ~ Albert Einstein