Paintings are physical objects with their own personalities... the size, surface, and brushstrokes are all important... and how the light plays on the surface. However, even a postcard has a physical presence that you don't get with a screen. And, of course, only one person can own the original. Therefore I have uploaded all my paintings to Redbubble for anybody who would like a print.
They also automatically print my paintings on products. I'm not sure about this as my work are paintings and not designs but will leave them for now to see if there's any demand.