I'll post an update on Soccket shortly. They wrote me back and I wrote a response. I'm very happy with the willingness to engage these questions.
In the mean time I liked this post on Hardballtimes. On ticket fees for Major League Baseball games. That is when you buy tickets online how much is added for the "convenience" of doing so? I wonder if baseball teams pay the same taxes on fees as they do on ticket sales. I had read airlines added higher baggage fees to avoid paying ticket taxes.