My guess would be that a lot of living room deaths are due to illness which would make the person unlikely to board a commercial flight, or other categories which certain individuals could reasonably exclude themselves from (drug overdose, suicide, amateur electrician work, etc.).

I doubt there's a good source of data, but I'd be very curious what the odds of dying in your living room per hour are if you exclude those categories and look at things like house fires, natural disasters, homicide, freak accidents (like planes falling on your house), etc.