Reporting spam on Spamcop's site doesn't do a single thing to diminish the amount of spam you receive. Sure, the reporting feature appears to work as intended, and does most likely email the relevant providers about spam, but you'll continue to get the same amount of spam from the same sources. Over a period of many months, I've seen increases and decreases in the amount of spam I get on any given day, but continually reporting it on Spamcop hasn't had any impact at all.
Don't bother reporting your spam on Spamcop, because the only thing it does is waste your time.