Or do as i do, and use your own scans :)
Doesnt matter that much, but they should use the right image (so no PAL game into the NA part), or just no image.
A week ago, MobyGames owner Jeremiah Freyholtz announced that the site was in the process of removing watermarks from all their scans. On May 8, the site posted news that all watermarks from their cover artwork scans and screenshots had been removed (http://www.mobygames.com/forums/dga,2/dgb,3/dgm,210103/), and their management has declared that images may now be used by anyone, in any way they wish.