I have some of the same photos on 10 different micro sites. Some are approved on one site while the same photo is rejected. Still 90% of my photos are from my 3 megapixel cameras, others are crops from my *ist DS.
@ Kelvin : If you're not exclusive, you can. If it would be worth the trouble that's an other question. Most do get around 80% of their income from those two agencies.
On my site you can see a breakdown of both my income (page 0) and those of others (page 7)
//www.perrush.be/SYF_micro_E_7.html