Or perhaps ideas need not only be had, but also pass through more layer of filters to make it into the world proper. Ideas that were had more than once had more

Or perhaps ideas need not only be had, but also pass through more layer of filters to make it into the world proper. Ideas that were had more than once had more than one chance. Ideas that made it into the world but were only once, were lucky. So that would mean there is a bias when looking at ideas that made it. So the correlation might be due to an inversed cause and effect.