All of it. Like 90something percent of it. And I think you meant to say
alt.binaries.pictures.erotica.*
I was the sysadmin at an ISP in the 90s also. We spent the majority of our time talking about that NNTP server. Is it worth it? How do get purchase more disk when the SCSI bus is full and disks are crazy expensive? How do we get more CPU? How do we keep the load down at sync time? I think we spent more time talking about that than playing doom.
Still, Horny Robs BBS files were all on alt.binaries.pictures.erotica.hornyrob (or something like that) and well, that kept a LOT of customers happy, so we keep that pile of servers running.