It's one of those difficult things to do a proper like for like comparison. When an ISP buys IPStream and a central pipe they aren't just being a fibre link that connects point A to point B but in effect a fibre link that connects 5,500 point As (every exchange) to point B (the ISP's datacentre).
To do the same yourself then yes the fibre link from each exchange is going to cost significantly less than a BT Central but you're going to need a lot more of them.
To LLU Sheffield and Rotherham for example an ISP may use another ISP's backbone like Telewest or BT to provide them with a dozen or so links to connect all the local exchanges together in one place and then a cross country link from there to Manchester or London maybe.



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