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I guess the reason that the multiformat stuff works against us more often than with us is that Sony already has a huge hand over the industry, and has most places developing games for the PS2. Other consoles however are scrambling to pick up what they can, and they are beginning to get their claws into the developers that may have once developed games solely for PS2.
You can take this further back though when the PS1 was doing it the other way round. The new guy on the market, the PS1 took everything, and totally trashed the opposition. X-Box is failing to do this, but it is managing to split the developers a little.