Consider a future person living a happy and fulfilling life. They're unfortunate enough to suffer a severe accident, but there's time to preserve and then scan their brain fully, after which they can be brought back up in an emulator on a computer.  It doesn't matter that they're now running on digital hardware instead of in a biological brain; they're still a person and they still count.
Now imagine this person or "em" asks to be let alone, cuts off all communication from the rest of the world, and rejoices privately in finally being able to fully explore their introverted nature. This isn't what I imagine myself doing, but is a choice I can respect.
Someone comes along and suggests turning off this person's emulation on the grounds that no one will know the difference, and we can use the hardware for something else. This seems wrong. Which means this computational process is valuable entirely for its own sake, independent of its effect on the world.
Unlike biological brains, computational processes are very flexible. We could run many copies, or run them much faster or slower than usual. We could run a specific segment of their independent experience repeatedly, perhaps the happiest few moments. It also seems unlikely that a full emulation of a human is the only thing that's valuable. Perhaps there are simpler patterns we could emulate that would be much better in terms of value per dollar?
I'm trying to reduce my concept of value and getting lots of strange questions.
I also posted this on my blog
 I think this will be possible, but not for a while.