I suggest the creation of a forum section called "Trash", where mods can move spam/useless threads there, after closing or deleting them. The purpose is so that these tons of threads aren't daily clogging up other sections (not to mention showing up in the front forum page).
Still think it would be pretty useful and would make each forum section page much more presentable, as it would enable people to look at them without making them swim through a sea of useless threads they don't want to look at or waste their time on.
This isn't just for the deleted threads that temporarily stay there, but also for the ones that are closed, simply because they either are repeats, or just don't add anything new, or whatever. Which, like I said, clog up the page and even the main forum page as the "latest post", and that can be annoying sometimes.
I think it wouldn't hurt and would keep things much more organized, but oh well.