Upload & Sell: Off
Also Olaf, in case you weren't aware, you are posting your images in the ProPhoto colorspace. People using browsers that are not color-managed are going to see the colors as being off. Also, since 500px strips the profile for thumbnails, almost all of your thumbnails over there look off, even when using a color-managed browser.
If you are doing it on purpose, fine. Just keep in mind that you are limiting your audience somewhat in terms of who will be able to see the tones and colors as you intended.
Thanks for letting me know that, I did not know.