I really did not think to raise this problem making and selling this object,  really...
I'm a commercial illustrator as Fred Gambino (not famous as him) and my customers are companies from from all the world.
Sincerly if someone model in 3D fron scratch one of my 3D background model of one of my illustration and sell it on Renderosity I don't rise any problem...
Actually some time ago a famous italian illustrator use one of my "free" Bryce object for a book cover... I ws just happy... :)
I do not earn a huge amount of money (nor a little amount of money) with this object, so I delete it now from my renderosity shop.
But I really think that you just want try the hair in the egg... it is really a microscopic problem for me...