You can get invites on the IRC channel, but make sure you already have a few ebooks on hand you can offer to upload

Is that like needing experience to get a job and needing a job to get experience?

People who don't have access to private trackers already would probably not have any material that anyone needs unless they personally pirated their own book direct from the source. (I remember back when people had to do anime trading by postal mail, how that would lead to a similar catch-22 where you couldn't get anything unless you had something to trade.)

It also fails in the scenario where someone is not really a pirate, but they just want a single item which is impossible to reasonably get through normal channels and so have resorted to pirating in this one instance.