It all depends on the likelihood of risk: If we were certain that hackers will get hold of all our online data and use it to completely compromise our identity

It all depends on the likelihood of risk: If we were certain that hackers will get hold of all our online data and use it to completely compromise our identity and company we SHOULD pay hundreds of thousands of Dollars! If we are worried that our wife will find some compromising information on Facebook then we should pay nothing and instead explain to her. If insurance companies will use our data to raise their fees our protecting should be worth at least the difference. If trump or some evil genius inside the NSA somehow turns the US into a dictatorship and use our data to to send our children to concentration camps (quite unlikely but not impossible) we should run to the bank and ask for as much credit as possible to save our privacy. So to average the above risks we should probably pay >2% of our income for privacy. That would be 10% of military expenses.