Shoutbox spam can I use it to my advantage

OK today I noticed that my shoutbox was being loaded with spam, I tried every fix listed but the spam just kept on coming. So I deactivated the plugin and deleted the call from the page. I later came back just to see if he was still sending spam to the system so I reactivated the plugin and low and behold the plugin was still being loaded with spam.

Now I have a couple of questions, which file is it in wordspew that he is able to write too? And can I use the free traffic hits to drive my rankings up by allowing the spam bot to still access the file? since it’s not being displayed anywhere on the site it’s only loading up the DB with bogus spam post. Now here is where the light bulb came on today, Is there a way I could create a cron job to empty that file every night say at midnight and turn the spammers bandwidth usage to my advantage?
Regards
Mark