The statistician George Box is often quoted as saying: "All models are flawed, but some models are useful". I'm well aware that the assumption regarding testers being representative of the broader userbase isn't exactly correct. But I'm curious if the estimate is off by a little bit, or a lot.
Based on the types of questions seen on various forums, there could be many more Windows users than the testing logs would suggest. And if that is the case, I'd like to devote some time to testing on Windows.