Don't forget the renewal discount for 365 days. Things wouldn't be atractive without those.
So it's more along the lines of 52.5$ monthly for referrals.
Yes, that 200 refs/silver option is also an alternative. The BEP is only slightly above the BAP at 500/gold, so it's a good option for limited investment.
Of course, getting Gold for $70 like I did is the best option of them all
Too bad GPTPlanet requires clicking daily. My first option was actually Scarlet. But since no promotion showed up, I thought they wouldn't do it there, so I went for GPTPlanet. Once they also launched their promo, I also went for it there, but since funds were limited, I stayed at 300 refs, using the earnings from GPTPlanet to boost to 500 in the near future.