Lee, why would you ever want to "throw away" content?
It may have earned all that it's going to on one site... but why not create an archive? That's what we do.

Or why not sort out older content such as foot fetish, bareback, glory hole, big dicks, so on... and create niche' sites with the content. It may be old, but like Mary said, your current clientelle may not be too enthused about the content, but you may have new surfers that may like it. So why not recycle it into something else to earn you even more revenue?