I learned about the watermarks the hard way at CA. The termonology is a little odd, they "accept" your site, but it doesn't show up on list or the search function. Guess how much traffic you get...
I am now trying to get some traffic to those sites by listing on some list that accept avs sites. Also, I have some sources for non-watermarked content...in general I enjoy building them as it is a little different and less structure...time will tell if it pays.
One question: the signup revenue looks nice, but does most revenue come from that, or from sponsor links (as in freesites..) ?