I do agree that it is hard to show the value of shows if you're established.
However, if you're trying to get your name out, it pays to be at the events and meet people in person so they know that you're not just a figment of the internet.
For business to business contact it seems like adultwhoswho.com could grow to the point where you no longer need shows. Especially if they act as diligent gatekeepers to the community.