To date, there are about 10,000 Glass devices in the wild, the vast majority of which include hand selected journalists, developers, and celebrities.
I respect what Google is doing with their Explorer program. While it’s Glass is now publicly available Google is still trying to abstain from it being touted as a consumer product. The overall public acceptance of glass is tepid and it’s uses not fully realized.
The fact that they can limit the release of them without ‘flopping’ shows a keen awareness of the Technology adoption life cycle.