I'm no apologist for Brompton; components are cheap, many parts are poorly engineered, the paint and wheels can be absolutely terrible and they use aggressive and barely legal retail price maintenance to prevent discounting by volume sellers. There have been no significant improvements since the LWB frame was introduced in the mid-2000s. You're paying over £1000 for a hi-tensile steel frame with features that would shame some kids' bikes, as has been said above.
If they are so terrible - why do you have one then? I'd recommend looking less at the cost than on the value you get. As you do still own a Brompton
(and bought three in total) they cannot be that crappy (or you'd be a fool). If they are so overpriced it should be totally easy to create, build and deliver a better bike for a way lower price - astonishingly such a bike does not exist. But as you say it would be easy: Do it - you will become a rich man...
Regarding cycle2work and the cost of the bike: What a consumer really pays is way less than the shop price with the help of cycle2work. And many sell their bikes at the end of the scheme for roughly what they really paid for it, so basically they got a free Brompton for three years (or whatever the period is) and get a fresh one after that if they like. Not too bad.
If you buy a Brompton out of your own pocket it will loose 50-100 Pounds in value each year over the first years and less lateron. That's aboutn 1 Pound per week. Again not terribly bad if you ask me...
But I totally agree that Bromptons are expensive (even Andrew Richie is unhappy about that) and that I would also love if some things were made more sorrowfully. But it works and it works way better than the competition and lasts longer as well. So the value you get is very decent.
And I think that taking a total bargain from a exeptional situation 11 years ago as the standard to judge on pricing today is not valid and will mainly make you an unhappy man.
Out of curiousity: If your judgement on Bromptons is that harsh - what on earth is your judgement on Moultons then: With them you can choose to get an expensive bike with the cheapest components and the worst paint job on the market (TSR) or a incredibly expensive bike with midrange components or a absolutely crazy expensive bike with good, but not state of the art components for a price you could get a bunch of cars for...
The other big advantage used to be parts availability but that's been shot to pieces recently; many parts are now dealer-fit only. That would stop me buying one now. I am quite capable of stripping and rebuilding a Brompton, and have done it to three of them.
It is worth noting that this policy as far as I know is only in place in the UK and nowhere else. The reason Brompton gave when inventing the policy a couple of years ago was that they want to get rid of trashed bikes that have been frankensteinized by completely idiotic and incompetent fools, are then sold in a dangerous and semidefective state and damage the image of the brand as well as potentially the health of the buyers. I cannot judge on the competence of the average UK hobby mechanic but when looking at used Bromptons from different countries those from the UK seemed to be almost always in considerable worse condition of maintenance to me. So I'd think there is at least some truth to Brompton's claim.