People are already effectively playing as NPCs in popular videogames. They're called gold farmers.

If you gave me the option as I got closer to 70, that I could be uploaded, and take up zero physical space, and live forever, I would jump at the chance. I don't think it's narcissistic at all. Imagine being able to communicate with your ancestors.. the opportunities for preserving knowledge and ending physical suffering, including the impact of humans living on the planet. Maybe we all just live forever until we run out of disk space. Maybe eventually we can have a lottery/queue where people take turns getting decanted for some IRL living.