You can make huge by participating in the bounty campaigns. You will get rewarded with rewards in the form of tokens which you can further withdraw from your wallet. You get paid for the promotions you do for the different social campaigns that you enrol yourself in. So, your actual money is not used and you make money by just promoting and marketing about the ICO.
Let me be more specific. Firstly you search qualified projects and calculate how much tokens projects will distribute and how many people will participate the project. And then choose your target bounty campaign. You should decide which bounty campaign you will join. There are lots of bounty campaigns. Such as signature, content creation, social media, reddit and so on.