Sounds like you guys haven't had any of your stuff ripped yet...or at least don't know about it.
Images are getting ripped left and right from many of the popular sites....they're getting printed and sold on the streets in the far east (mostly).......some have even ended up on ebay.....
So, would you be happy about some guy stealing your 70+ hour render and then putting it on a print or t-shirt and making a few bucks?
It's happening....trust me, I see it every day.....