Biz Idea – Employees buying online at work through affiliate portals

People buy things online at work. Companies provide affiliate revenue. Why doesn't someone start a company that redirects employees traffic through affiliate programs so that when John logs into Amazon to buy something at work, his company gets the affiliate revenue.

The start up would provide the simple code, then sell it to IT departments to reduce their costs (they would get a share of the revenue). They could also have an easy DIY download for small businesses.

Thoughts?