The increase in productivity was directly related to the increase in quotas month over month. It started at 18 sites per month, then was elevated 4 months in a row until it got to 22 and then more and more people started missing the quota, so they backed it down after developers started leaving, or just gave up. Thus, you had an increase in production while upper management essentially found the breaking point of the team, then rest the quota right under that level.
I think upper management thought by giving us something like ROWE, we could continue to burn the candle at each ends so to speak, and not have our managers breathing down our backs about metrics and still make quota since we could work at home at our own pace and on the hours of our choosing. One of the developers surmised it was because they figured if everybody was out of the office and at their homes - we wouldn't talk so much to each other to figure out how really bad it was.