Interesting project. Congratulations on the idea.
I like to see competition in this matter.
I will be looking for exchange for my Passive Coin in the future and I am not going to pay $3000 to get listed on Cryptopia.
Cryptopia should pay me to see my coin onboard.
Just joking!
In my opinion, you should consider bounty/free giveaway but not to the overall crypto-crowd
.... but, targeted to active coin dev. team/persons that could stick to your project, list their coin and do some publicity about your exchange.
One day, it could be a proud to add to my website: Passive Coin is listed on ATUM.
Anyway, good luck to your project.