Most churches don't even have a dedicated graveyard anymore. Only the really old ones do. People who attend churches seem to bounce around a lot from location to location over their lives either from job relocation to just being unsatisfied with whatever church they were attending, trying to find one that they can 'fit in'. That and graveyards seem to take up a lot of real estate, more of which a church would be hard pressed to keep as part of their property due to cost and the fact that many churches either die out or relocate due to expansion over time.