Honestly, I think the last paragraph weakens your statement. Asking for an up-vote and delegated SP may appear to some as a kind of spam. Maybe adding "I'm not a BOT and my aim is to clear posts by trolls and spammers." to the end of your first paragraph, and removing the last paragraph would make it on-subject and to the point.
In any case, you are doing a marvelous job in an area that badly needs policing!
Will
Thank you Will,
I changed text and banner because i've considered all advice given by authors who saw my action against spammers in their posts.
I opened this post precisely in order to allow me to take my followers advice's in high regard. So I'll take your advice and i will change the text. ;-)