Give small amount as bounty for the testers then you will see people rushing into your site.

yes theyl probably rush due to bounty but the question is that will they give legit feedback ? or what if they will only take the bounty without doing any valid work. this is why its better to have a non bounty test.
I am not an active trader or have time to do this as well,so wait for the right one with enough time to do
maybe you will be convinced and you will done the testing if they include a bounty or a reward.
If your exchange got bitcoin included then consider it moving to the bitcoin service discussion board where more reputed forum members were actively involved in discussion.
for sure it include bitcoin because its an exchange but you got a point tho because these board is still under the altcoin board. .