Absolutely keep reporting spam. We don't have time to comb through all the threads most of the time. We mostly just clean up whatever the filter gets, and the filter catches a lot.
However user reports are excellent to get the posts that the filters miss...particularly sig line spam links and short non-sequiter posts that might contain a tracking image or something. Another dead giveaway is short unrelated messages from a profile with an ICQ icon...no one uses ICQ anymore do they?
So yeah, please keep reporting (although if you report a given spammer once, that's usually all that's needed, we nuke all their posts at once) and many thanks to the members of the forum who have been contributing to the efforts to keep this board clean and free of ads.