Recently a mate of mine blogged about how Macbooks can only be repaired by apple technicians. This is a story that sort of passed me by but it's becoming increasing common.
I wouldn't have got into IT or learnt anywhere near as much as I have if I hadn't been able to tinker with things. I'm a tinkerer by nature and that's how I learn.
It seems many companies now days are going out of their way to make it hard to open up their product and understand how things works. This isn't just Macbooks, it's everything from lawnmowers to electronic doorbells.