"...and even non Smeg ones!"
I'm not too sure that Smeg are a particularly premium brand when it comes to stand mixers!
KitchenAid are the big brand in this area and their small mixers start at around £375
"...they always start a little on the high side but e entirely go down cheap as chips ... these things never go down in price always remains on the highest price range"
I would disagree with you here. I bought a random stand mixer from Amazon in 2021. It was 1,500W and had an 8L bowl. At the time I paid £175 for it.
It has been absolutely fantastic, I use it to make bread every week and for lots of other things as well. Three years later it's still going perfectly fine being used two or three times a week.
In response to your comment, I just had a quick look online at Amazon. The specific brand that I purchased is no longer available, but an equivalent mixer (1,500W and an 8L bowl) on Amazon is available for £140.
£175 in 2021, after inflation, is around £210 today (source: https://www.bankofengland.co.uk/monetary-policy/inflation/inflation-calculator)
The fact that you can get a product with equal specifications for only £140 today does suggest that these things are getting cheaper.