As roberjerman stated above, the term High End was introduced to hi-fi criticism by Harry Pearson in the first issue of The Absolute Sound. I found the term to be not to my liking, as it smacks of elitism and snobbery. Plus, implicate in it's use is the assumption that more expensive equals better. At the time of first seeing the term, I did not know it was already in use in regards to other types of consumer products, and in that use referred to price more than anything else.
I much prefer J. Gordon Holt's (founder of Stereophile, and creator of "subjective" reviewing) use of the terms "perfectionist" and "high-performance" in critiquing hi-fi. Those terms address the issue of sound quality, irrespective of price. Any given product may provide perfectionist or high-performance sound quality without necessarily being high priced.