The mods or whoever should do this job should delete all the threads not used so there is not like 100s of pages

Good thinking. This is now scheduled for 2015-04-01.

Until then we'll keep threads for historical purposes and because there's no benefit in deleting them.

You don't realize that we're humans too, not computers, it'll take us hours, days, maybe even weeks to look through every page and find the useless ones and delete the useless threads, it's easier to just let them die and go to the other pages.

And yes, Fish has scheduled this for 2015-04-01