I can understand not wanting others making money off of something you have been so generous to give away for free. I understand not wanting your work to be redistributed. I don't understand not wanting your work to be used in a commercial render. I think it would be quite flattering, as Ernyoka1 has stated. Not to mention the free advertising as long as you were given proper credit. I avoid using anyone's freestuff for anything other than personal renders. Too many read me's get overwritten, and I can never remember where I found the stuff, so when it comes to giving credit where credit is due...I am at a lack for words.