I have two MacBook Pro's from 2007 which are still running strong. These are the 2.4 Ghz Core 2 Duo machines with 4 GB's of ram. They have been through a lot and I've had Apple fix various issues over the years on both of them, but disposable they are not.

I've replaced the batteries for them, actually, I've had Apple give me new batteries due to them failing early... but I've never had issues with Apple not servicing my laptop. They have dents in them, they have scratches from wear and tear, they have stickers all over them, but they still work extremely well. Still run the latest version of OS X, still run all of the software I use on a daily basis.

I used to own an iBook that I had purchased in 2004, an iBook G4, when I purchased my new MBP in 2007 I sold my iBook to my dad and he used it till 2010. The iBook is still up and running, it is simply too slow for my dads needs so he bought a new MacBook Pro and absolutely loves it.

This is basically a longwinded way of saying that I disagree with your assessment that they are disposable machines. The amount of life and longevity in a Mac are to be envied, and the way they hold their value even after a couple of years is simply awesome.