Nr. 2 (and no, it's not the stinky kind)

Yep. Normally, the profit from them is very low.
However, using their summer promo, where all RR were $0.15 (plus 30% discount on 365 days renewal), the math turned more interesting.
Not OMG awesome, but interesting. Especially considering it's from an old established site.

Same goes for Scarlet-clicks, but I focused more on this one, since the promo started earlier.

GPTPlanet and Scarlet are pretty much the same thing in terms of ads. Few ads, low value. You do get more when you're upgraded of course.
It's because we only earn $0.001 from each RR click that the profits are usually quite low. The optimum point is to stay Gold at 500 referrals, where the price of each ref is still $0.15. By getting more referrals than that, the cost per referral increases and the margin is smaller. In terms of time to reach ROI, 500 RR is the best.

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.

Meanwhile, in cashout land, a newcomer arrives