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The Apple app store is still a work in progress.... It should be a matter time when they'll work out a method that allows upgrading apps in the near future. Not too long ago, the apps didn't have any method for in-app purchases. Now it's a common thing with iPhone apps.

The App store just merely augments and does not replace Macupdate.com and versiontracker.com.

I still use macupdate.com because they sometimes offer discount codes for various programs or spotlight programs that you never thought you'd like.

I know that the developer for PCalc on the iPhone offered a discount code for the PCalc desktop when you purchased PCalc for iPhone. So there are workarounds at play here....