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If you pay licences per machine/cpu socket/cpu core, those $5k might be your cheapest option.

Sure, if what you’re doing is easily scalable to another machine.

There’s a lot of software out there, legacy and otherwise, where the throughput ceiling is what you can do with one box.

Just the mere fact that such a processor exists,is not in the official catalog and costs substantially more, tells me that there's adequate demand for these or at least the particular customer has very deep pockets if they can ask for custom build.