I have bought a couple collections in the past year from guys who started a run and then couldn't finish because life interrupted or their interests changed. I like taking something that someone has started and carrying it on. And they appreciated the fact that I would keep their books together, add to them, and register them so they could periodically check in and see how I'm doing. Some are even keeping an eye out for the last few elusive issues I need to finish runs so that they can still participate in the joy of collecting without a lot of expense.
MK and the Doctor have both put together runs that need to be finished. And if for some reason they can't finish them, or choose to pass them on before they finish, then I also hope that the runs stay together and get finished.