Come to that, I suspect most conspiracy nuts do it for amusement, too.
There are a lot of things--environmentalism, conspiracy theories, being convinced that we live in an oppressive nation--where if the person pushing it seriously believed what they were saying, they would have much different behavior patterns than they do.
Movie stars talk "green" and fly private jets.
Those who claim that we live in a country where we are just inches from being hauled away by Darth Cheney go onto an international forum and declare endlessly that Bush sucks. None of them loses any sleep waiting for the knock on the door.
As for the evil planetary cabal that rules all things, if Lindy actually believed in the things she reads and links to all the time, she'd never get out from under her bed.