When
you rent referrals, you do so for a month. But then you have always the
option to extend your current refs for 30, 60 or 90 more days. Now
usually extending a referral for 30 days costs 28 cents with a Standard
account. By extending them for 60 days you receive a 10% discount and by
90 days 20% discount (thats 50 and 67 cents per referral respectively).
Now this may seem like a no-brainer, but take in mind that if you're building your Neobux empire without investing a single cent,
90 days extends may not be your best option.
Look
at it this way: by extending for 30 days, you're left with more money
on your account and you cant rent more refs faster. In the long shot,
those extra refs will produce you more money in those 90 days than the
20% discount without renting more refs would.
If
you do invest, then this is no problem for you. I strongly suggest you
extend for 90 days and keep renting as more refs as possible.