do we need a separate forum?
no, until there is more traffic or more elaborate projects this should suffice (IMHO)
Have you seen any other coin, with a decent web presence WITHOUT its own forum?
This is the Bitcoin forum, and in reality they could nix the alt-coin forum tomorrow if they wish. In fact they consider the Alternative coin forum as a courtesy and nothing else.
JKC having its own forum also gives people a place to post and read without all the noise.
No
We need an Exchange to sell our JKC with good price and after going to mining another coin

community...community... What for ?
Worldcoin appears later than JKC and now he is trading here mcxnow.com/ And all have a very good profit ! Also as CHN, BBQ, BTB and etc
May be JKC is not so good and no Exchange wants to take it ?
Sorry for my english
Good luck with the race to the bottom. Take a good look at the value of all the recent coins fast tracked into an exchange. Every one of the coins you mentioned have ballooned and burst.
If you have bothered to read the thread, you might have seen the multitude of times I already posted about this. I will give you a hint, without the community to keep the trading volume up, the value of a coin will drop like a brick.Again, take a good hard look at the value of coins fast tracked into an exchange.