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HSMs are on an entirely different level compared to credit card readers.

To OP, those devices are not cheap - they run $22k from SafeNet (dependent on what model, obviously). In addition, FIPS criteria is meant to be tamper evident (not tamper resistant). SafeNet does require a special key to recover after a tamper attempt, though: http://goo.gl/RyVtFj

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HSMs also vary by manufacturer. The SafeNet Luna you linked to has both tamper as the case level and tamper as the actual HSM level. If you read the FIPS documentation for the SafeNet Luna SA, it has a PCIe card inside with a cryptographic module on the card that is the core to the system. Tampering with that is ever more destructive than just opening the case.

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