Quite right.
Another person in strong agreement here.
My old battery Acer Aspire One is still after 5 years my primary choice for travel. Although only £210 new, it's been treated to a few upgrades over the years; a new 1366x768 screen to bump up the resolution (£75) an SSD when the rotary rust failed (£80), an extra gig of RAM (£10),Windows 7 (£50) and a bigger battery (£20).
Adding this up, I see I've got a £500 device now rather than a £200 one - not too far off the cost of a similarly specced new device.