Here I'll post 3 main strategies with 0$ investing to high investing possibilities.

0$ investing Strategy:
Membership: Standard
Rented refs: Never over 50
Direct refs: As much as possible
Autopay: Off
Renew: 90 days
Highest possible earnings:
If you get 30 good direct refs and 50 good rented refs, you can make up to 1$ per day.

150$ investing Strategy:
Membership: Golden
Rented refs: Over 200 and under 750.
Direct refs: If you dont want extra work, you dont need them.
Autopay: Off
Renew: 90 days
Highest possible earnings:
If you manage to rent 750 refs and you keep them with a good avg, you can make up to 5$ pure profit per day. That means 150$ per month for 1 year. Conclusion, you invest 150$ and cashout 12 times more!

1500$ investing Strategy:
Membership: Ultimate
Rented refs: 4000
Direct refs: If you dont want extra work, you dont need them.
Autopay: Off
Renew: 90 days
Highest possible earnings:
With this amount of referrals, you'll make around 10~15$ pure profit per day, in the end of a month you'll be able to cashout over 450$!