How much do you earn from your refferals?

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Hi there, i need money but i can't take a lot of them just by clocking ads every day, i need to use ref links to earn a lot, but i don't know if i have to trust sites that ask to rent ref links, maybe is not true that i can get a lot of money with them. What do you think about this? Do you think that ref links are good to earn more? Thank you for your responses :)