I don't know how widely accepted this usage is, but I found a reference that discusses differentiation strategies in terms of "high end" vs. "low end" (cannot copy because of restrictions imposed by Google Books).
http://books.google.com/books?id=ds9_9HQAkyAC&pg=PT138&lpg=P...

If this is not the precise term you were looking for, maybe it will at least spark additional ideas.

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Note added at 20 hrs (2013-06-27 17:09:57 GMT)
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Here's another reference that talks about "high-end differentiation" (Midas, Atlas and Hermes are from Greek mythology; they don't refer to the company names that will be familiar at least to US readers):

This chapter has illustrated the various ways firms have used to differentiate their products and services in order to compete effectively in contemporary markets. There are three general categories for differentiation. They are the high-end Midas products and services, the mass-appeal Atlas products and services, and the low-end Hermes products and services. There are identifiable revenue benefits for using a product differentiation strategy, but there are also R&D implications...

The same source also titles one of its graphs:
Broad-based Versus High-End Differentiation Strategies for Cell Phone Devices
http://2012books.lardbucket.org/books/developing-new-product...