A very good way is similar to gambling. You buy them, and then sell them when the price has gone up. I managed to make 1.2BTC that way. However, be careful when you buy/sell as it will depend in the price. Always choose the right time to do so.
Gambling is not the safest way to make some money. I would recommend high volume PoS coins, even if the price goes down a bit, one still can reach ROI, just have to wait a bit longer.
BTW, I like your nick.
Can you define High volume? Most PoS coins deliver a whopping 1% interest per year, That really isn't that much. You would need to invest about
BTC100 to get
BTC1 per year. And most of these coins have small volumes, so that you can't really buy that many without raising the price to oblivion. Anything above 1% interest per year is pretty big inflation meaning you would get poorer by forging coins not richer. Anyhow what coins would you recommend? I've heard about DMD and NXT being pretty solid picks. NXT because of the community and DMD for the scarcity.