I think chasing technology is a significant expense.
That's a tricky one, as the sweet spot seems to be for the tech-savvy user who isn't interested in the latest shiny.
Kim has it right.
"Bleeding Edge" Shiny stuff is expensive but there's a problem for the Apples of this World, their tech has reached a point where there are only slight marginal gains to be had from their new stuff.
The latest iPhone advert tells me I can have face-recognition to unlock it and have Emojis that sing along with my face (I tend not to sing at my phone though). If that's the best they can come up with for £1,000 then they are in serious trouble.
Camera-phones were pretty dismal for 10 years but now they aren't, they are amazingly bloody good. I've stopped looking for a better camera phone now.
Digital cameras were in a megapixel war for 15 years but that's stopped now, we have enough pixels. 12Mp is absolutely fine for 20" exhibition prints (and how many people need images bigger than their friends' phones anyway?) The market for compact cameras has collapsed (because of camera phones).
Stick to the previous generation of shiny and it's all becoming very affordable (and perfectly good enough...unless it's an iPhone being deliberately knobbled by Apple of course.).
There's really just one iteration of Moore's Law required for me to be perfectly happy. I need a truly portable laptop, like my wonderful and tiny Dell XPS13, that can handle 4K video editing.
All my stuff is 1080p (which is generally as good as most people need) but I'm aware that 4K will be ubiquitous in 5-10 years. I expect I'll pay the same for that Laptop as I did for my "1080p" Laptop (Thanks to Moore's law).
I doubt many people will be in a desperate rush for 8K and above TV but I can understand why people with TVs the size of their wall would like 4K definition.
8K brings with it some serious implications for bandwidth and storage... for what? Resolution that you really can't appreciate unless you replace a house wall with an OLED TV? (Most 4K TV streams are compressed below 4K, 8K streams will be compressed even more). I really don't need to see News-readers' nasal hairs the size of my furniture.
Once I have that 4k Laptop I'll stump up for a Panasonic Lumix GH? camera, with 4K video and I'm done. I have the bikes I want and the Motorhome I want. I'll have all the photo/video gear I need for amateur work and a Laptop capable of editing/publishing it. I can go cycling and I can read one of the 1000s of books on my (old but perfectly adequate) Kindle. Done.
Of course I expect the Tech Giants to continue to push more CPU intensive features, in order to sell more shiny, but I don't know would tempt me. VR seems as dead as 3D. It hardly gets a mention any more. I tried it and it was a fun novelty for an hour.
Camera-phone software will improve to generate DSLR type effects but physics simply prevents them from ever replacing the quality from big pieces of glass on a "real" camera*
*The latest iPhone has a nice camera but it costs more than my full-frame DSLR camera body....so it should be a good camera.
I can walk around a CURRYS superstore now and genuinely think, "meh", from start to finish.
The one major advance I'm waiting on now is Electric Car range. As soon as we have Ford Focus type cars, with a genuine 300 mile range, I'm in. That's going to happen within 5 years. Tesla have seemingly cracked the range issue, the costs will obviously fall with volumes.
So, before retirement proper, I think it's wise to de-clutter and, if you do buy things, make sure they are style classics and hard-wearing (Think Victorinox Swiss Army Knives, Seiko watches, Canon L-series lenses, Barbour Jackets...etc).
Buy well, buy once.