There is a market for somewhat bigger projects as well, I am Swedish oasf so not quite as high salaries and such as there are in Norway but it is still a possibility. When it is discussions about building new houses for a few million then paying a few thousand for realtime visualization is not a big deal. If you can provide results in good quality and time it wont matter to bigger companies if they have to pay 5x as much as long as the things are consistently on time and the results are good. Also as soon as you have things done you can reuse them in other scenes, it is not like you need to redo a whole lot unless there are special demands after all.
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That might be. My father and sister run a mid-sized office (10-15 employees), but they handle very big projects. For these kinds of things, they really just go for it when building villas. When building commercial buildings the project is often very fragmented (other companies doing interior and another company doing landscape architecture), and the interior may even be done after the exterior is done. They are therefore limited to renderings of facades in their presentations.
So in other words, they use a lot of Polish people to render stills of these big project. A VR walkthrough would really only be feasible in smaller villa projects (running around a 100.000 NOKs or about 15500 USD), or projects that repeat the same base architecture over large areas (kinda like suburbia, without the “hell” in suburbian hell).
I would, however, send demos around to companies, as the ArchViz demos offer close to the quality from a rendered still in real time. It is a grand step forward from what architects are used to (as far as I know).
Of course, the bigger offices (100+ employees) tend to centralize everything, so you might get to do commercial buildings with them. I really have no experience with those kinds of companies, though 
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