Like any good nerd I spent countless hours trying to figure a way to remove and use the screen on one of the broken laptops piled up in my closet. There's no good reason for that level of waste.
By contrast, I just bought a brand new 32" TV at Best Buy for a demo monitor. It was $450 and does 1920x1080.
Laptop LCDs use a variety of different interfaces, so it's hard to make a generic kit. By the time you do, the volume demand for such a kit is so low, you end up with having to price it in the $200-$300 dollar range to make your R&D and manufacturing costs back. For about the same money you can get an LCD monitor of similar size/resolution to the laptop display in an easy ready-to-use package.
brk sums it up. It's one reason I don't like laptops in general. Tossing those perfectly usable screens attached to a faulty motherboard is pretty distasteful.