I think it really just depends on your business. Are your clients mainly low end to midrange, or high end? As to your comment about “real” HD occupying only a small niche, that’s already the case. Those who can afford “real” HD will choose it. If you offer post services for pro HD formats, you can automatically charge more and get higher end work than if you stick with HDV, etc.
Having said that, if you live in an area that doesn’t have much demand for pro HD production, then you’ll be wasting your money just to offer services that no one wants or can afford. If you don’t live in one of the industry hotspots and you have connections to major markets (LA, NYC, etc.), you may be able to offer services at rates that are competitive with post houses in those cities, as you do not have the high overhead that they do. However, it could put you in a precarious position – the high end clients can afford to have their work done in high end post houses with high end infrastructure that no individual could ever hope to match. The “prosumer” clients or indie film clients, once limited to using either DV or true pro HD, are now focusing their attention on the new consumer HD formats (HDV). I think the middle is dropping out, with work either going high end/pro HD or low end/prosumer HDV.
Who butters your bread?
😉