I don't think there'd by any issue with it getting damaged during transit. It could be shipped around the world in less than a week. And considering that the Philips Hue solution costs over $500 USD, which people happily pay for, there's definitely a market for this and considerable profit to be made.
I came to this forum looking for the same thing as OP, and was honestly surprised that no one has started doing this yet.
The only real issue I can think of is the security risk... whether the person creating these puts some kind of malicious software onto the Raspberry Pi and they access your network or are able to spy on your screen's output and relay images to themselves.