question is, why are they still left?
Maybe because they were bloody expensive in the first place? Top-end bikes don’t sell in large volumes, so dealers have to be mindful of the fact that they could be stuck with an expensive bike that they can’t sell easily, when next years stuff comes in. Many shops have a ‘flagship’ bike in, to attract custom, but often end up selling them at a discount, sometimes even at a loss. It’s the £3k+ bikes that draw the customers in, to buy the £300 ones.
I’m all for bargains. I bought a lovely steel (Tange Prestige, I think) Saracen, one of the last decent bikes that company made, a few years ago. LX/XT kit, was about £900 or so originally, I paid £300 for it, after a bit of haggling! It was down to about £500, had pedals missing (they gave me a pair of SPDs for free), and I hummed and hawed with them, over a few small cosmetic scratches, and the ripped saddle. Sadly, it got stolen. Sniff.. 😥