Desktop GPUs on Laptops?

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Those things do absolutely exist, it's just that finding a laptop that supports it (or where it is easy to hack it in in one way or another) is rather seldom, as this is obviously not an intended functionality out-of-the box on most of them. I would probably not recommend it myself, as getting it to work is /probably/ going to be a pain on most laptops, and do often not have the expected performance gains and it does obviously reduce the portability and practicality quite a bit depending on how easy it is to set it up and take it down each time you need to move the laptop. That's obviously not much of a concern if the laptop isn't moved around, though, but it's still probably going to get a bit messy on anything but the few (gaming) laptops out there that are made to support it.

EDIT: And yeah, the external monitor requirement is also rather important unless your laptop happens to have a display input.

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