Stats On Job Satisfaction

I saw a stat that only 25% of people are satisfied with their work. Whenever I see this measure of job satisfaction, the statistics actually "prove" that not many people are happy with their work. They will either give you a result of a high percentage of people being dissatisfied with their job, or a low percentage of people being satisfied with their job.


What I am interested to know, given this evidence, is if anyone actually understands the outlook on life as a whole of the sample of people measured, that results in these stats? If you ask negative people (pessimists) any question, they will give you negative feedback, in spite of their true experience of what is. If you ask someone with a positive outlook on life (optimist), they are likely to give you a favourable experience of what is. More often than not, people want to publish bad news as that is what they also tend to read (bad news sells).

Are these people in the sample of job satisfaction surveys satisfied about their lives? Are these same people satisfied about anything? Some people are actually happy being unhappy so nothing is ever good enough. Results based on people who are pessimists about anything, will skew the results of what is being tested when looking to establish job satisfaction. 


So are these job satisfaction surveys a reflection of a normal sample of people, or are they a reflection of people with a negative perception of how they are experiencing life? Are these job satisfaction stats really true?