Twittvertizing and a Web 3.0 search engine

A blog post by Jonathan Morgan below outlined Twitter's new rules for ad networks. It seems to me that the new rules for twittvertizing are not so much to "preserve the enduring value of the service" but rather a clever move to help promote its new search engine when it rolls out to the general public. On Monday, Twitter announced at the TechCrunch Disrupt Conference in NYC that its new search engine was going live. However, I wonder how Twitter will deal with celebrity sponsored tweets? With Brittany Spears earning up to $20k per endorsed tweet and Kim Kardashian $10k, celebrity twittvertizing is a big business that seems to be odds with a credible tweet engine.