Is this safe to invest in MLM sites like helping-hands?

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From last year i have seen many MLM sites which shows new plans to help each other. In these plans you have to commit some amount to help someone else after around 15 days a request for help come to you of your committed amount then you have to deposit that amount to that person's bank account. Then you can request to take help of your committed amount+bonus calculated on your committed amount. I tried it with giving help of 5000INR and after 3 days of depositing INR 5000, i got 7000 deposited by some other members in my account. Now i reinvest earned 2000 from it and earning more. What i think its risky but it works till the owner of site backout.There are many sites similar to this like helpingindia, helpingasia, karjamukti, mmmindia etc.These plans only works in india because members have to contact other members and deposit money to their bank account. What do you say about this way of earning?