i submit to two only. what was mention about different sales is different. however as much as i want to cater to the market needs i cant due to limitations like lack of studio equipment blah blah, can rent yes but i've got no income so i got to make use of whatever abstracts or street shots that i can pluck whenever i go shooting and make full use of them as stock photos.
in fact my last trip to sentosa for a street shoot including sunrise my day's shot all of them was submitted to Dreamstime and all were approved. now just hoping they can sell, of which 1 or 2 has made their first sales.