I think kamagames sale will be a success but lots of investors from here will not attend to that sale due to fact that kamagames won't be listed on an exchange, so investors and bounty hunters won't be around that much.
And what's the point in the KamaGame tokens, if they will not added to the exchange? Why should investors buy them?
You can trade KGT token on any Decentralized Exchange (Forkdelta, Token Store, etc). There is no need to list token for trading on such exchnages. All that you need are just ERC 20 contract address and decimals.
Also, I am sure that some centralized exchanges will want to list KGT voluntary (without official request from Kamagames side).