I would say YES!!!!!
Think about this for a moment. 0.20$per submited image, 300 images per day, do the math and equal 60 $ per day
IF you have 300 good images every day. IF not that's ok try just with 50, and you will get 10$/day just from uploading images.
Do not forget about the extra 10% from each sale!!!!!
So, if you have in your portofolio more that 50 images, and you want to make more money, BECOME EXCLUSIVE!!!
I can guarantee you will see the diference in the money you make! Trust me i have tried!!!!