What you don't know
For those who do not care about trading their privacy for free software:
You may not be aware of the capabilities of data mining and using multiple sources along with strong algorithms and predictive software. As everyone becomes numbers and stats, if give godly power to those who have access to it. Strong marketing power to separate you from your money... before someone else does... and seeing trends... just like you watch schools of fish swim on the discovery channel. It seems to me that it offers an unfair advantage to those that can afford it. It undoubtedly also lets politicians and the powers that be see what to say and how to get your vote.
So it is not just a matter of your individual privacy that matters. It is the collective privacy.