Once upon a time laptops were harder to upgrade but even they have been getting easier over the last several years and are quite easily upgradable now if you know what you are doing.
Most people don't know really know what they are doing. Some find it hard to turn on the laptops, let alone fiddle around with installing memory!
I agree completely with what you are saying, though the same goes for pc's, it's just there are more pc engineers and availability of components, so laptops aren't as competitive as PC's, but like CnM said, laptop parts aren't so readily availabe therefor aren't so reasonably priced, I suppose if you can find a good supplier of laptop parts it could work, I wish you luck should you decide to go ahead with it.
Thanks I think i will stick to Clothing, but it was just a small idea that popped into my head. Maybe i will have a search around to try and find a good supplier.