FWIW, as a point of interest, in the full-range, dedicated room world we refer to mass produced, Best Buy type of gear as mid-fi. High-End is always defined as high-performance, price irrelevant. For example, we see HD600/650 as High-End, meaning high-performance, while this site defines the cans as mid-fi (I'm guessing) due to their cost. Quite superficial, and very telling about this market and its participants.
I wasn't meaning to convey anything negative with the label, and I'm aware how it's applied differently in the world of speakers. However, here on Head-Fi we typically say mid-fi in reference to the price range of about $100-$500. Neither application of the label is any more valid than the other, and just because they're defined differently for different subsets of the community doesn't mean that any particular subset should change their use of it. It may be a little confusing for those transitioning between headphones and speakers (or vice versa), but neither use of the term is invalid.