This is getting to be a bit of a dubious distinction.
A quick observation as we cross this milestone:
Hordes of qualified people aren't going to be flocking to this site to answer questions, especially the people interested in the topic: personal finance bloggers. The few who are on here (myself, JoeTaxpayer, littleadv, and a handful of others) are the exception. The average personal finance blogger is more entrepreneurial than the average programmer. They (PF bloggers) will see not only little opportunity to promote their own work here, but also a group hostile to said promotion, and either go where they can leave their website URL as many times as they want, or just build their own blog, attract their own traffic, make their own money. What works astoundingly well for programmers works very poorly for personal finance guys/gals; we (as a whole) know exactly what digital sharecropping is, and know to avoid it.
I participate because I like helping people. But I've always enjoyed benefiting financially from what I write about, and considering I'm the fourth-highest ranked user on the main site, and have less than 300 profile views, total, the reward (to the rest of my online presence) is miniscule compared to the time I spend here.
CFPs and the like probably won't come here in droves, either. Too many legal restrictions on what they can say, and they're probably going to want to use the site to bring in more business, which is all but verboten here.
So, that's my take as to why we're still in beta, why the number of questions per day still "needs work" and why the site's visits per day is stagnant.