Very interesting.
If you don't mind my asking, what kind of work are you typically doing with d3? Visualising what kind of data and for what purpose?
I have worked among others with data on local traffic (congestion and travel times), interaction between players on a field during a game, computing performance, some internal manufacturing metrics. I think there's quite a few areas where people want dashboards that are both fancy looking and informative, either for their clients or for themselves.
Some people just have a vague notion of some data they somehow want to display, others have quite precise demands (typically: "I've seen this d3 example and I want the same with this and that specific interaction/effect added.")