In my opinion, it probably is. Depends on how satisfied you are with your current sources. Are you "set for life" on some nice private trackers or was the closing of RARBG a problem for you?
I've been on IPTorrents for a year but only used it when I couldn't find what I wanted elsewhere, but in the weeks following the shutdown of RARBG, I've been relying on it much more. I also got in to TorrentLeech when they opened signups for RARBG refugees and I like it.
So, based on that, I guess Usenet isn't worth it? I'd much rather try to use my footing in these two private trackers to get access to other ones. Perhaps I should be asking if there's a good place to do invitation exchanges? I have three IPTorrent invites that I'd be willing to exchange for invites to other trackers.