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I R Scientist
The number of defect pixels does not scale inversly with the price of a sensor. Sonys Exview HAD CCD sensors for instance have a really nice sensitivity and alone cost more than some complete cameras, but usually have more defect pixels than a 3$ cell phone camera. Your pixels are not really "hot", more like a little warmer than the rest, so they didn't get mapped as defect in the factory. Also, see the bright patch in the upper right corner? That's the readout stage of the sensor. It is slightly warmer than the rest thus causing more dark current. You can use photos like this to subtract the dark offset for long exposure images.
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