In Tufte's writing, he notes how people are more naturally drawn to the larger and darker pieces of the visual representation, especially in the cancer death rate map of the United States.  My representation also employs this technique, as it can be seen that people are more drawn to the larger bars on the graph, and the little sprites of less popular games kind of blend into the form and are even harder for users to focus on with the hover ability.

Viegas and Wittenberg specifically spoke about straying from this point plotting representation to map online traffic flow: