i've found the marketplace good for buying ( i don't sell much at this moment in time) and its good as you see members post and you get to know them, dnt also has a rating system which is a good sign of who you are dealing with as well.
but having said that an intro should be an intro about you and not straight into a request, this will allow members to get some insight into you as "webmaster" doesn't really say a lot.
so give us some interesting stuff here, then skip over to the other categories and ask question there so we keep the intro area to its purpose.
in my experience the more involved you are the better deals you get, both ways
tim