The Secret to Succeed with GDI is Teamwork.
 
If you refer only 10 persons and get others to do the same look at what happens:

Level 1 - You Sign up 10  = US$10 monthly

Level 2 - They sign up 10(10x10)  = US$100 more monthly

Level 3 - They sign up10 (100x10) = US$1,000 more monthly

Level 4 - They sign up 10 (1,000x10)=US$10,000  more monthly

Level 5 - They sign up 10 (10,000x10)=US$100,100 more monthly

This adds up to an earning of US$111,110,00 monthly.

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With this approach you will not only succeed but you will also be overjoyed
by seeing everyone else succeed.