How much would it be worth to pay someone to Digg an article you wrote?

Here is how I figure it would help me. Every time I write and article, I make sure to send it over to Digg. Often it will get a few Diggs within a few days and thats it, some of my more popular articles have received several in a few months. The big picture thought, is that every time I write an article I notice a majority of my traffic coming from Digg and I have even received some good comments and subscribers from the site. So, How much is it worth? Could one calculate a CPM or CPC for Digg submissions. Can I coin the phrase “CPD?”

To take is a step further what If I held an ongoing contest for guest bloggers, the person who writes the article that receives the most Diggs in a year gets a thousand dollars? Would there be any issues with this? Would Digg blacklist me or what?