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Perceived value is what the consumer got out of the product.
Actual value is the cost to make, including research cost.

If you only game on your PS3, the perceived value for the system is the same whether it came with a DVD drive or a Blu-ray drive.

When you use your PS3 as your Blu-ray movie player, then you suddenly got higher perceived value.

How many PS3 owners are using it to play movies often enough to justify the additional cost?

Had they come separately, those that only want gaming out of the PS3 could buy the system at much lower price.

Meanwhile, it really doesn't interfere with those that want a Blu-ray player, since they could easily buy a standalone.