So, today's ad issue got me another $0.44 so I got to BAP group 4 now.
I see the next BAP group is earning ~$0.969 just by the ad issues, so combined with the achievements and referral bonuses, I guess I'll be able to hit my milestone there.
It needs another $20 in purchases so we'll get there eventually.
Btw, one thing I've noticed is that the actual amount we receive from a referral's $1 bulk ad purchase is $0.07, so that helps keep things clear in our calculations (many thanks to Rui for helping up).
Some additional stats are that a 50 visits bulk ad gets delivered in ~24 hours based on my own stats, so running a 50 visits campaign daily for each program I advertise kinda makes sense because that's how long it will take, while benefiting from the number of purchases achievements.
The banners get depleted almost instantly though..