May I ask a question?
Why keep the computer so long? Modern Macs hold their value so well you could sell your imac after 3 years and buy a new one. I know it may sound like non-frugal idea but your TCO (total cost of ownership) will be the same or lower. With Apple Care you will never have to worry about a internal problem that could cost you as much as the Imac is worth.
I know you mentioned cars but automobiles are different animals. They lose their value rapidly, offer longer warranties, and have more repair options.
Why keep the computer so long? Modern Macs hold their value so well you could sell your imac after 3 years and buy a new one. I know it may sound like non-frugal idea but your TCO (total cost of ownership) will be the same or lower. With Apple Care you will never have to worry about a internal problem that could cost you as much as the Imac is worth.
I know you mentioned cars but automobiles are different animals. They lose their value rapidly, offer longer warranties, and have more repair options.