You do not have to use Stocks Exchange if you are investor and miner. You can mine (as miner) to local wallet (versions for all major OS available) and then hold it (as investor). When we see a real value for the coin, more exchanges will add it by own initiative.
But if you want to mine and dump ASAP, then you need an exchange. But then hardly you are investor, aren't you? :-)
You know, there's a thing called "trading" that a lot of "investors" do.

That's when you send your coins to an exchange, trade them for BTC when the price is high, then buy some ITNS back when it's low (from people that "mine and dump ASAP"). You can do a lot more money by trading the coin rather than by just simply holding it in your wallet. And that's what investing is all about making money isn't it? The problem with ITNS though is that you can't do any trading at all at the moment, cause the only exchange that has it is the shitty stocks.exchange that doesn't work: it takes hours to deposit/withdraw, and now they completely disabled the ITNS market, and on top of that for some reason my ITNS balance there is negative now.
http://i66.tinypic.com/vqrxpi.pngHowever you put it, it's no good for a coin to be listed on a single exchange only, especially when that exchange is ran by incompetent people or hacked or scamming etc (all are real possibilities in this case).
A negative balance! I thought my issue with them was bad enough! Does that mean they will come after you for a payment to get back in credit! Hope yours gets sorted to.