Comparison of face-to-face and e-PB

Richard Fahey recently wrote a nice comparison of three PB processes that use differing amounts of online engagement, in Toronto, Berlin, and Belo Horizonte. Interestingly, he suggests that a greater percentage of participants had low incomes in the face-to-face processes than in the e-PB process. One of the reasons PB has been so popular is because it tends to at least partly reverse the standard political bias towards the more affluent. Does e-PB take the social justice out of PB, or does the online participation just need to be designed better?