Both games (sports?) involve skill, computers, tons of pressure, a reasonable amount of stamina and a mostly male demographic. The number of for-money tournaments offered by online poker and eSport organizations differs drastically, however.
Online poker sites offer real-money tournaments starting every minute 24/7 with $1 million-guaranteed tournaments available every week.
There is no such system in place for eSports and generally the big prize pool events must be carefully organized with numerous sponsors.
There is one stat that is reasonably comparable for eSports and online poker, however, and that’s the biggest single tournament of the year.