Can I add something to this?
When posting QP to the gallery I would suggest that people type SAMPLE or water mark it across to avoid piracy. Even 600x600 qp are often grabbed for piracy (people sell them in a CD or even on the net. This way it will be useless for them. When adding the SAMPLE word across you can lower it's opacity, not to be so disturbing on your page (let's say to 40%) but it will still be useless for them.