Don't worry about offending me or anything... But here is how I see it. It is too early for the "new" posters to be showing up in the top 10 of all time. Those are the people who have been around for a while, and it takes a while for the newbies to catch up no matter how much they are posting. A much better angle to look at is how many new people are moving into the lower ranks of volume. I researched the posters who were ranked 51-100 in total posts and 23 of the 50 had joined since April.
Also I have notice that new people tend to stick to safer things at first, such as game threads and the suckass of the month stuff, until they get comfortable. Go back and read some of the game threads espesially over the last couple weeks, and you will see a lot of new names. Eventually these people will most likely start to join into more discussion and some of the off beat stuff also.
I know I have seen about 5 or so new people in the last week or two join my PTC contest. Plus I have also noticed more people in the YNOT contest as well. Plus I believe that our post counts are higher than any other white sox boards around. I know on a day to day basis, we are higher than both WSI and the ESPN boards, someone else can verify the MLB counts for me, but it seems like more and more of them are coming over here as well.
Really they have built it, and they are coming, when it comes to this site.