There are zero good private trackers that you can pay for to enter. Buying invites will get you banned, and paying the site directly is only possible on scummy trackers.
There is a lot of good information here [0]. Most notably RED is open via interviews conducted on IRC, and has a big invite forum to join other trackers. But yes, they do force you to contribute through maintaining your ratio.
There are zero good private trackers that you can pay for to enter. Buying invites will get you banned, and paying the site directly is only possible on scummy trackers.
There is a lot of good information here [0]. Most notably RED is open via interviews conducted on IRC, and has a big invite forum to join other trackers. But yes, they do force you to contribute through maintaining your ratio.
[0] https://igwiki.lyci.de/wiki/Private_trackers