"Where's the kaboom? There was supposed to be an earth-shattering kaboom?" –Marvin Martian

Skye Jethani’s (Out of Ur) take on evangelicalism, celebrity, etc.  The only thing I would add to what he has to say is that “megachurch” probably also includes “large church networks” as well.

Are the publishers evil for focusing on sales potential more than quality? Of course not. They’re businesses that have to sustain themselves. They are simply reacting to the realities of the market. But sometimes they fail to see how they also shape the market by their decisions…

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Megachurch leaders offer publishers pre-existing customer bases (their own congregations), and publishers make megachurch pastors into celebrities to perpetuate and expand their bottom lines. As a result, evangelicalism is not a meritocracy where talent, gifting, character, or wisdom result in a broadening influence. It is an aristocracy where simply having a platform entitles you to ever-increasing influence regardless of your talent, gifting, character, or wisdom.