I work for a financial exchange company, and there are many positive reasons why this particular exchange has been in existence for 150 years, so to suggest that there is no value in it holds no water. Markets serve customer needs.
As for crypto-currencies, the current market is very volatile which creates opportunity for great gains in a short time. For example, I bought a small sum of a currency a couple of weeks ago which has now quadrupled in value. However, with high volatility comes high risk as that same currency could just as easily be worth nothing tomorrow. As with trading in any market the key to success is understanding the commodity you're trading. Actually making trades is easy, making the right trades at the right time is where you make money.
My top piece of advice if you want to dabble with crypto-currency is be absolutely, 100%, prepared to lose everything. Don't invest money you can't afford to lose. I have some investments live today which may come to something, but may also come to nothing. I hope they work out, but I'm fully prepared to lose the lot and I'm not going to be homeless if that happens.