Celebrities auctioning their .. Tweets?

That’s right folks, Tweets are a commodity to be sold, traded and auctioned off.
At least as far as TwitChange is concerned, it is for a good cause.  There are several types of auctions where the celebrity in question will Mention, Retweet or just Follow you – all of which could be huge for your twitter handle.  Imagine if The Bieb tweeted your handle to his bajillion followers.  You’d probably get an amazing influx of new followers — but those 12 y/o girls probably don’t care about what you’re eating for breakfast.  Unless you’re eating Justin Bieber Fiber-Os or something.
I’m tempted to swing some cash out for the lower priced celebrities.  Go bulk instead of a single high-priced celebritweet.
But thinking about more than the excitement I’d feel from someone like George Lopez following me on Twitter, I have to wonder what’s next.  How soon till their tweets aren’t just sold for charity, but for another revenue stream.  I mean, they package themselves up in action figures and t-shirts and other such knick-knacks — why not sell a tweet a month?
Why just celebrities?  I can see an open trading marketplace.  Tech Gurus and “Social Media Experts” swap mentions and retweets to puff up numbers on both sides.  Authors hawking their books trade with musicians talking about their albums.
That’s all rather doomsday of course, but now that I’ve mentioned these ideas, they can’t be put back under the rug.  How long till that tweet-bazaar (which might even exist already now that I think about it) opens?