The major media aren't paying for this stuff. ... (T)he key to success is a business model that includes the citizen-journalist, one that does not just take advantage of him. Papers that use free editorial help are making a devilish deal. They're assuming that the citizens are honest, and looking for work based on their honesty. ... You need some way to assure the readers that the game isn't rigged on the one hand, and some way to give contributors a stake in the game on the other hand.
He also notes that the quantity of citizen contributions can overwhelm readers, putting a premium on filters that point to the best stuff:
... (A)s camera phones proliferate, the volume of such pictures available is just going to become overwhelming. Making sense of what's out there, and getting rights to the good stuff, are going to be keys to success.