Sony obviously thought it mattered, I mean they broke their promise for profitability for this financial year and they thought it was worth it. So yes it obviously does matter to some extent. Sony must have thought that lower sales would have a more negative effect that going back to large losses in the short term.
I suspect the reason for the large PS3 price cut was because Sony was fearful of losing consumer acceptence, retail space and certain games. They aren't ready for a new generation and slacking PS3 sales would have forced their hand so in the short term some heavy losses are probably more palatable than an early start to the next generation and an early exit from this one.