If you are an established poster, so can sell your sig for a nice amount of $$$$.
Most people who sell their sigs for high amounts, are big players in this biz.
But some of them are just board whores, who entertain the rest of lonely GFY'ers all day.
Important note: it is not sufficient to post a lot here and be perceived as a big player. It is also necessary that people know your face. Quiet may be an exception here, but hey..I don't hink he sold his sig.
