Definitely worth it. It pushes actual worthy discussion down the page, and it will then be forgotten in an hour, and never return. You see this all the time. I appreciate it from the standpoint of a user of the forum, and I'm sure a lot of other moderators do too. Unfortunately, I only remove topics when there's not many replies, and they are pointless. Otherwise, I'll lock them, but if they are out of my jurisdiction I'll ignore the report, and allow another moderator with permission to lock it to deal with it.
This is quite true that it pushes things down the page.
And jurisiction? We a country now or something?

It is a lot better to lock topics with a large number of replies. If you're after not paying people for their sigs, move the thread to archival (they usually don't get paid that way)...
I'd rather get to the point where we are removing these trash threads than simply just locking them. It's better to do that when they don't have any replies, and before they become a problem.
Yeah otherwise you get a lot of reports in meta going "welsh deleted my 50 copy-pased posts 50 pages down this spam megathread aargh".
There's several threads asking the exact same question or generic statement. I'm pretty sure they look down the page, and take inspiration from previous threads, and can't think of their own content so just use already existing content.
Probably when their "I'm interested in this too!" comment gets deleted

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This is the kind of thread that could have been nipped in the bud by a dedicated board mod looking out for these kind of things. This thread could have been locked on page 5 without losing any quality content. Instead, it remained open for another 1000+ shitposts.
You've persuaded me that locking is better than nuking. While nuking spam megathreads would harshly punish the spammers, it would also discourage those who participated in good faith, which kind of misses the whole point of a forum, hence I am convinced.
That said, the thread I reported is still accumulating shitposts...
There's also the thing that something that never started as a spam megathread in 2014/2015 has turned into one later down the line. There will be quite a bit of loss in activity points if this happens and a lot of spam in the meta section about how someone's be demoted from legendary to sr or something...
I have previously suggested a decent suggestion in this thread. Auto-lock threads after 25 pages because these OPs never return to address the replies nor do they want to discuss the points. These threads are as good as getting an "Abandoned" tag in front of them in the front page.

I did with all the megathreads I made. Still commenting on them every few pages or so...
I reported posts on them as spam in 2015/2016 (when spam seemed to be accepted) and then didn't report any ever since because they never got deleted.