Price differences between the US and other countries helps.
As an example in the US Adobe sells Fireworks for $299, in the UK £299 exc VAT. That is a phenomenal 100% mark-up for a downloadable product.
For the CS3 suite the difference in price between the US and European prices is around $1000 more and a similar story can be found across it's other product ranges (e;g. Coldfusion).
Adobe's world pricing is a complete joke and encourages users to circumvent paying local taxes (VAT) . It is cheaper to fly to America, buy there and fly back.
I believe Adobe has been reported to the European Commission for it's pricing policy, but Adobe have a policy of pricing to what the local market can handle. In this case us non-us individuals apparently can handle being fleeced.