Ah yes, but what's the average price of a litre of petrol (UK - £1.05)? What's the average price of a two-bedroomed house (UK - about £180,000). What's the average interest rates and taxation rates? Comparing gross salaries between different countries is a non-starter unless you can back it up with cost of living figures, retail price indices and taxation rates.
Cheers
Whirls