... don't rely on Applecare, .
I am someone who has owned Macs since 1989 and who has, on occasion, needed AppleCare. I can state without fear of contradiction that this statement is wholly without foundation. I strongly recommend AppleCare for all Mac owners.
To the OP, you need to understand that a new computer is a capital investment. You don't need to replace it every two weeks. Your computer hardware did not suddenly stop working when a new model was released. Your computer software did not suddenly become incompatible with all of your files when Apple introduced new versions.
My computer at home is a 2003 dual 2.0 GHz PowerMac G5. It is nearly six years old and works like a charm. My main computer at work is a 2005 liquid-cooled dual 2.5 GHz PowerMac G5. It is nearly four years old. Last weekend, I ordered a new 2.93 GHz 17" matte display MacBook Pro. I expect it go strong for the next five, six, seven, or perhaps eight years.
Apple owes you a quality computer for the price of a new machine. That is what it sold you. The person who buys a new computer after you bought yours will probably get a faster, more powerful machine. That is the way of technology. Learn to live with it or get professional help.