You can trade your token in decentralized exchange like Etherdelta or Forkdelta.
If you want to buy or sell it, just place few orders there, no need to waiting for listing by team.
Listing token or coin in exchange is not cheap. Maybe the dev team don't want to spend their money on listing.
but usually those registered in ED or FD with prices that are manipulated or not actual. very cheap price. and if they are part of a scam they will not be able to sell because there is no way that someone will accidentally buy junk coins.