Drifterlee and Renderosity should be aware of another issue that the stolen issue bring to the legal front. Some of those images MAY have product that was never intended to be sold in a render, but for the personal use only. I know, personally, I have downloaded a number of free items that state "for personal use only", no "commercial use."  Now besides stealing the art from the site, they are also encrouching on the the people who made models, textures, lightings, props, and materials. Also it may go as far as copywrite problems with the bigger companies like DC, Marvel, Lucas, for example, if the items lifted were FAN ART that they are currently using in a commercial manner (I avoid the sales issue, since you might have to PAY to get on the site .) Just an awareness of the issue and how big it can get when you have free items that are/were only ment for personal use like BATS, ISOP, and FAN ART created for the enjoyment of the artist. 

Just a thought. 
Mike