That's probably because you don't grasp what can be done with this data, and for how long this data will be around. The bottom line is in the relation between privacy and freedom.
There's a few point to raise here: how do you object or prevent the sale of your data ? how much of the money from the sale of your data went to your pockets ? what control do you have on your sold data over time ?
Then it's not only about you and your life, ever heard of first they came [1]?