This is what I am having trouble wrapping my mind around. What could possibly be that important?
There is zero chance that suing 8 people will stop piracy or even reduce it. The RIAA sued thousands with no success. The D&D pirate market it not supplied by just 8 people. So this can't be it.
There is zero chance that suing 8 people will deter others. The RIAA sued thousands with no success. People will keep pirating and will keep downloading So this can't be it.
It seems not uncommon for the RIAA to go after people that just download via bittorrent or similar options, without acquiring a regular copy and than offering it for others to upload.
The latter case might actually be useful to sue for - since most people will not go through the hassle of buying something, possibly cracking it, and then uploading it.
Technically, if you're using bittorrent and most other filesharing tools to get your illegal copies, you become both a provider and a consumer of pirated material, but from your view of personal responsibility, it wasn't you that provided the pirated copy.
How many on EN World download MP3s, TV show episodes or PDFs? I have no idea.
But I bet that the number of EN Worlders that actually rip a CD and offer it on a bittorrent site, or the numbers of EN Worlders that download a Players Handbook PDF from DriveThru, remove any existing watermarks and then upload it to a bittorrent site so that others can consume it, is quite low.
Most downloaders wouldn't even know how to do this, most don't care to do it. Heck, most _can't_ do it. (How do I remove the watermark from my Pathfinder Beta PDF? I have a vague idea to begin with, but I am actually working professionally with PDF and related technologies!)
So yes, going after 8 specific "pirates" might be exactly what you need to do. Especially if you have reasonable information suggesting that they were the primary source, possibly in more than one case. (Though I don't know if that's also true.)
And if these 8 (or just some of them) are convicted, it becomes clearer to the pirates that there is a real threat of getting caught.
So much at least, for my theory.
It doesn't seem to work for the RIAA, but the RIAA covers a lot more organizations and also has a different customer base. Transforming CDs to MP3s is also a lot easier than digitalizing (scanning, OCRing) books.