When considering investing and earning bitcoins, be aware of scams and ponzi schemes. There are too many of them. "Get rich fast" almost always amount to losing money.
But, there are also legit sites out there where you can earn some coins, although not that "fast" as promised by ponzi's. Still, you need to do your own homework.
For example, you can save your coins at Bitbank (http://save.bitbank.com) and earn some interest. It's the mother company of BW.com pool. They manufacturer chips/miners and build facilities using user deposited coins. And pay back part of their mined coins as interest to the users. Ultra cheap electricity and labour is their advantage.