We are talking about the same application with different data - one for each city, all sold for money separately.
It is like a GPS application with maps for different countries, in which you have to pay for each map.
As long as the market doesn't accept the possibility of selling add-ons for the same application as one record only, they have to accept this kind of posts.
BTW the same happens in similar cases in Apple's appstore and in the Android Market.
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Helio Diamant
Editor www.mobilityfreak.co.il - The Hebrew Mobile and Wireless Website