We can see on GraphicRiver is not many sales, I thinking about more advertising for GR. Example: We creating theme ecommerce and for products we adding photos from GR with watermarks(we getting photos from preview). In description we adding Credits and where people can buy this photos.
Why it’s good? Sombody have a shop with cameras, he going to TF -> Buying Theme and he see camera photos and he thinking.. “Oh my good! In my shop(Real Shop) I have this cameras! oh.. I paid for theme, then I also can paid few dolars for photos and this photos it’s gonna be good for this theme because I see in live preview this photos and all looks good”.
That has been discussed, you can take any preview image and put it in your preview (preview only, not the main file) and credit it.
Yeah, here’s the official thread: http://themeforest.net/forums/thread/watermarked-previews-in-item-previews/60411?page=1#538902