As above, #5 is pretty off. Granted there are products out there which use the label unnecessarily, but at the same time there are plenty of times where features will only find themselves implemented into gaming oriented products because it has limited applications elsewhere.
I also disagree with #1 and #3 to some degree. There's no argument from me about iPhones being overpriced, but this is a theme among the entire high end smartphone industry and not just Apple as a way of making people buy into lengthy contracts. The difference is Android manufacturers are in perpetual competition with each other and are constantly creating better products that devalue older ones, while Apple refreshes its phones annually and demand remains pretty static throughout the year. Do you honestly think Samsung and HTC wouldn't still be selling their S5 and One M8 for their initial £599 RRPs if they could get away with it?
As for Macs, the MBA line still play pretty competitively with similarly spec'd ultrabooks and have a key advantage in battery life, and the iMacs are actually among the best value all-in-ones of any brand right now. The Retina Pros are also relatively well priced for the 13" models compared to other premium, slim, ultra high res notebooks. Everything else falls at different points on the overpriced scale but the non-retina Pro is probably the only thing in the lineup that costs double its Windows equivalent, that thing's a relic that needs killing off.
Beats are the true kings of tacky overpriced tech. 3x the price is being generous when it comes to some products in the lineup like the Mixrs, and while their recent Solo and Studio revisions show promise they're still woefully expensive.
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But yeah, as for my submissions;
*The premium audio market has a pretty chronic infection of bad, expensive headphones since Beats were able to capture the majority share of the market with bad products. Virtually any product with a rapper behind it is typically awful, with 50 Cent's headphones getting my vote for the single worst overall line of headphones currently on sale. Monster may have lost Beats but that's not stopping them putting out crap under other names. Skullcandy's cheap stuff is crap and sells unreasonably well, but they've put major stock into improving since 2012 and their higher end (typically the high end segment is deemed to start at $100) stuff has been consistently pretty decent. There's generally a lot of crap to sift through to find something decent on the high street these days.
*Lots of basic point-and-shoot bridge cameras are pretty indistinguishable but can cost hundred on pounds. Not only do they usually fail to justify their price tags over similar cameras with prices in the double digits, at £200 you could easily get a refurbished DSLR kit direct from the maker which will destroy anything in the price range for image quality (DSLRs obviously aren't for everyone though). Generally these cheap basic cameras don't add enough value compared to either a cheaper alternative or even just a good smartphone camera.
At the opposite end of the price range, Hasselblad, one of the most venerable camera brands on the market, have rebranded a couple of Sony cameras (Sony RX100 becomes the Hasselblad Stellar and the NX7 became the Hasselblad Luna), making them uglier, and quadrupling the price with virtually zero technical improvements in either case. Needless tonsay reception to these cameras wasn't great.
*Virtually any cable selling for £30+ for any other reason than sheer length. The appreciable difference between an acceptable quality cheap cables (aka no defects affecting their usability) and premium branded ones is almost universally non-existant.
Those are the ones that immediately spring to mind.