I don't but one of my bosses did. Very industrious gentleman. Ran a full farm while working with us. He had a fire in his bio-diesel barn, burned to the ground, and even made the news.
His insurance canceled him because they said it was a commercial facility and they didn't pay any damages. Other than that he felt it was worth it. He had a network of stores he would collect cooking oil from so his supply was pretty stable. Apparently, the commercial insurance was pretty expensive.
Don't know any more details than that.