According to Federico Zannier, his privacy is worth exactly $2,733.
He tracked his web sites, pages viewed, mouse clicks, keyboard strokes and recorded his face as he traversed the web.
Through a Kickstarter project he offered his information for sale, at varying quantities (full week, full month, full data set), along with tools to track your own web life if you so choose. You could argue that his investment to create the tools, track the data and then package it up required more time and money than the $2,733 covers, but it is an interesting exercise regardless.
More serious startups and established businesses (like Reputation.com and Personal.com) have evaluated ways for their users to sell their “personal data vaults” to marketers, but it remains to be seen if users will find the effort worth the payback.