James,
I'm a little confounded as to why you're still looking to Glassdoor as your primary source of information on employee satisfaction after Gayle indicated that she has much more comprehensive data on this subject from the employee survey.
Also, I will stand up and say that I, for one, am not a fan of WMF trying to match market pay in the SF area. I am interested WMF in retaining qualified and motivated employees, and I am interested in employee job satisfaction which includes pay as only one of many factors. If pay was a widespread problem then I'm sure Gayle and Eric would be seeing that. I expect that, as with many nonprofits, the mission of the nonprofit and the satisfaction of working on the mission with like-minded people will compensate for the lower monetary compensation.
It seems to me that your concerns about HR issues have been generally well addressed by Eric and Gayle. Gayle has also agreed to do an IRC office hour, which would be a good opportunity for you to ask more questions if you're still not clear on the applicability of Glassdoor vs. the applicability of the employee survey data.
Pine