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A couple of reasons I think.
1) People are nervous about mounting something on their corrector plate
2) Not many people really know about it.
3) A lack of big reviews and images to compare side by side.
4) Cost.
5) Not all SCTs can utilise it.
6) Only one manufacturer, and they are in the US.
7) You require a different $90 + freight adapter for each camera you want to use.
To answer point one, it it really easy to fit and remove. Crazily easy, takes me less than a minute.
As for cost, it costs more than an ED80, and whilst it isn't expensive for what it is, it isn't cheap enough for 'a punt' for most people
The last one is the real killer though, I spent ages trying to find a scope to suit, you can use a non-hyperstar celestron, but the price goes up by nearly $400 or so, and that adds to the cost.
I think it is a bit like video astronomy, once you get into it, you can't understand why it isn't more popular, but there aren't a lot of vendors, it is hard to see one 'in action' and the alternatives are better documented.
I love the thing, getting 15 minutes of data in under a minute is a great thing. Getting 4 hours of data in under 20 minutes means multiple targets are possible in a single night.
Attached are some C11 hyperstar images from a self confessed beginner John T.
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