When you report spammers, they get banned (after many hours). Then they create a new account starting the process over.
If instead, you put them on ignore they will keep spamming, yet you won't see them. Less work for you (don't have to keep adding), less work for gaz (don't have to keep banning), and less work for the bots (don't have to keep creating new accounts). So join me, in the STOP reporting movement.