The answer is 50
In the newbie FAQs forum you'll find a recent post stating the various levels until you reach Mike's lofty position. He's gonna hit 10,000 any day now so he will have the official title "ABW's (gruff but lovable) Curmudgeon".
Never be afraid to try something new. Remember that a lone amateur built the Ark. A large group of professionals built the Titanic.