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Besides, if it's a good game that has made it across OK then why shouldn't I buy it? Put it this way, if developers want to port games like Tony Hawk's and Twin Calibur across then so be it. You moan that we're getting ports of PlayStation games, yet you don't want Rare to go multiformat. So make up your mind.
And generally these aren't just 'Ports'. Recent games such as Turok Evolution are being developed simultaneously for both PS2 and GameCube, possibly Xbox as well. The only reason that PS2 versions come out first is that the PS2 has a larger fan-base already installed so the developer can test the waters in an environment where they're unlikely to get stung as much.
A port can still be an original title, as can a sequel.