Why do bikes de-value so fast?

While I'm not looking to buy another bike (yet!), I often see whats about on eBay and am pretty shocked to see how cheap used bikes go for - even if almost new condition.
For example, I've been watching a couple that finished last night and both remained unsold. Both had been ridden only a few times and from the pictures, looked in new condition and had a new price of £5k+.
Just seems odd why they didn't sell at just over £2k?
Kind of reminds me of the car industry, once you've driven your brand new motor off the forecourt, you lost a good chunk of its value already.
For example, I've been watching a couple that finished last night and both remained unsold. Both had been ridden only a few times and from the pictures, looked in new condition and had a new price of £5k+.
Just seems odd why they didn't sell at just over £2k?
Kind of reminds me of the car industry, once you've driven your brand new motor off the forecourt, you lost a good chunk of its value already.
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this is lost as soon as you take delivery, that’s 20% gone ,
Plus people bidding are going to put in a value they want not
What you want as a seller therefore on these sites prices
Will be low .
The discount for second hand is all about provenance and ownership history. It's purely what people are willing to pay.
2011 Specialized Hardrock Sport Disc (son #4s)
2013 Decathlon Triban 3 (red) (mine)
2019 Hoy Bonaly 26" Disc (son #2s)
2018 Voodoo Bizango (mine)
2018 Voodoo Maji (wife's)
Value is elusive, for example a top end Scott Spark is an awesome machine for what it's designed for, but its £9K to buy new. As a used bike its not really in the trendy area of 'long, low, slack' people now look for and as such it's only really going to appeal to an XC racer or someone with deep (and full) pockets who wants a fast XC style to trail bike, it would probably struggle to make 50% of that at even a year old, while a more fashionable and modern bike will hold value a lot better, like say a Spesh Enduro.
At the bottom end though prices have gone up, it used to be easy to pick up some semi decent and totally useable MTB's (Damped forks and hydraulic discs) for circa £100, now you'll often pay nearly double that for a similar bike.
I bought my current bike used for a bargain price. One year old, owned by a Transition team rider with a love of huge jumps. Most people see that as a bad thing and wouldn't touch it. I know that a pro rider lands 60' jumps smoother than a punter lands a 6' jump.
Titus El Chulo 27.5 | 2017
Trek Slash 9 27.5 | 2015 (building)
Embrace it.
I bought a used CX bike that was originally £1000+ but knocked down to £800 as it was "last year's model" (Jan 1st). 15 months later I bought it for £350 because he realized that he didn't like it. That gave me a lot of upgrade budget.