Upload & Sell: On
What is lacking is a way to insert a watermark onto the photo after resizing it.
If you upload a high rez photo straight out of the camera, unwatermarked, to Instagram and Facebook, you are as good as giving it away.
I never uploaded anything other than small low-quality JPG's, and my copyright notice is embedded in the photos which Facebook automatically posts in the description field.
But I would also upload full-rez photos to clients via email, sometimes via text which was very handy.