Right, that's the calculation any consumer good producing company has to do. When we buy industrial equipment we pay a huge markup for vendor promises that they

Right, that's the calculation any consumer good producing company has to do. When we buy industrial equipment we pay a huge markup for vendor promises that they'll support for 10+ years. It's painful at the time but we have automated manufacturing equipment that's been running 20+ years. When I purchase controllers, sensors, motors, etc. it cost me double or triple what I could have paid but now I'm happy I did. But I also know that our products (PCs and printers) can't have that same support model, we'd be out of business and we don't have a lucrative ad business that could buy us customer loyalty via loss leaders. I think 5-8 years is reasonable.