It is not advisable to invest your bitcoins in shares and anything similar. Bitcoin gives you freedom of valuation, meaning it is rising its value day by day (recently crossed gold) which means you hold it in your wallet and trade/sell it for higher rate later on. If you want to increase your bitcoins then I suggest you to open up your own faucet and put some advertising on your page. There are many companies who will pay you for putting advertisement over your website/faucet. As you can see, people are crazy for earning bitcoins. Newbie's always start with faucet who are your customer's. For visiting you share as low as 100 satoshi's but earn like pot of gold! 

FYI: It is good to be on safer side rather than being greedy.  I would choose advertising way rather than risky shares.