I respect where you are coming from, PlayfulPhoenix--but I think you are missing the mark.
This solves a pain point that is not being addressed at the consumer level. Magma has a successful product line that is designed to alleviate the pain point of expanding I/O. What you are proposing is replacing I/O.
Replacing I/O might be fine and dandy for casual use and for strictly gaming, but those of us who have to travel and have software or output that does not lend itself to being replicated easily to transfer from system to system would like to be able to have enhanced abilities without being separated from our day to day tools.
For someone to make the claim that this product is overpriced, I challenge that and say you have to compare it to a less expensive product that does the same job. Your solution is messy and complicated and does nothing for me who spent 6 hours setting up a show on my laptop in studio and wants to work on it at home. If you work in 3D you know how long it takes to setup a program to suit your workflow, let alone the scores of plugins and settings that you require and media assets you can use for a project. No way do I have time to mess with that one TWO computers when I just need one to be beefier for certain tasks. My friend who manages networks for a major airline has to travel constantly and desires a super sleek, easy to transport, laptop at any cost. He could build a couple new PCs for his offices and home, but how much more complicated is that then purchasing an I/O expander (or two) and having the days work at his fingertips but have the muscle he needs for his 4k monitor setup.
We would all love to have these products cheaper, that is coming, but compared to the industry this is not overpriced. It is actually competitive. Apples to apples. As for me overestimating the cost of production--I'm thinking more about entire cost to market. Alienware spent "millions" of dollars developing it's Triad chassis--why, I don't know...but I do know there is a huge difference in cost between putting a product on the shelf and building a one off in your garage.
If you want to compare apples to oranges, I could just tell you to buy an Xbox bundle instead. Or throw away your watch because you have a cellphone in your pocket. 
Peace!
