This is a speculative mini-investigation that I did in 2013 as part of my GD masters thesis work. This plugin that tracks and displays the names of advertising networks and data brokers that track you as you visit sites. It acts as a calculator and bargaining system to deal with them for licensing of your data.
Before creating this prototype I did some limited research on data brokers and ad networks. In reality, $2,130 a year for a single person's data in 2013 is probably more than a bit inflated based on how data brokers actually purchase data (in bulk). But pennies are pennies — and pennies add up over long periods of time. I suspect most individuals would at least be curious to know what individual data is worth over a lifetime and if free access to certain systems and tools online really offsets that value.