I think, there are two ways from earn Ethereum.
1.Buy some Ethereum and start trade with altcoin and make more Ethereum.
2.Work with Bounty and signature campaign Who give direct Ethereum coin and Earn Ethereum.
Buy ETH is not a good way to earn ETH. And i dont see any bounty campaign that pay participants in Eth. Can you show me some bounty campaign ?
buying ia the best way man.. we talking about earning eth by trading. you can join bounty of any ico and gain eth by trade them. but if you need more you need to give more .