Investment are looked at two levels.
One is that you Pay a Membership Fee and then get others to join under you. The persons under you also have to Pay and that is how you get a percentage. There is always the fear of falling into a Scam Site and thereby loosing out on what you have Invested.
The other Investment is Time and Energy. There are Sites that make you do tiny OnLine Tasks and then they Pay you for the same. They also Pay for the various Members who join under you provided they are also active and do the tiny Tasks. These are rather safe Sites as you will atleast not loose out on the money, since there is no Financial Investments that you are to do.
Some Sites go a step ahead and have the above two requirements together.
Why do most people think that Earning Money from OnLine Tasks is easy. It is as time consuming as any other Task would be. All tasks require your Time and Dedication. If you are not going to LogOn to your Sites on Daily Basis and Two To Three Times Per Day then do not expect to gain anything. Do not join if you think that 'I do not need to work'. It is important that you understand that you need to do daily work to gain any Financial Gratification.
So, the important part is that you need to Register. Work Daily. And then get the rewards. If you think that you are going to sit back then it is better you do not join.
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