Fair enough, none of that has ever been a thing for me.
Okay, extremely obscure things have dead torrents, but I’d wager you won’t find many of those ultra obscure downloads on Usenet either. I dunno about any letters either, I suppose my country is a bit too small for anyone to care, because I’ve been torrenting for nearly 20 years with no issues - and so have many of my friends.
The ratios I’ll agree with you on. It’s a damn competition on private trackers, really annoying because everyone else wants to seed too. I just use public trackers.