Why not poison cookies. (Score 1)

First time poster, long time reader. I have been wondering why more people don't poison cookies rather than blocking them. Its relatively easy to open the sql database that firefox uses and replace numbers and strings with random similar values, I'm sure it could be automated. It seems like it would be better to make tracking companies data worthless, rather than simply blocking it. I wonder if there is a way to trade tracking cookies (obviously some cookies shouldn't be shared)?