Insuring a 7 is nowhere near as expensive as you'd first imagine, especially when you bear in mind the performance available. Prices can start from as low as £100 per year, though the majority of people have premiums of between £2-300 per year.
A Potted History of the Seven Kindly written for http://www.se7en-up.co.uk by Eric McLoughlin.
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Hints and tips on buying a 7
Caterham Sevens are not excessively expensive cars, though over the years the search for higher and higher performance derivatives has pushed prices correspondingly higher.