In my experience, most companies don't think this way, but definitely should think more like this.
That said, companies that need more speed often don't need that extra speed on just one node. So that's really $5K x N nodes. When you consider that just the CPU costs $15K, and not the complete cost of a system, I think it's a lot harder to justify. You better have that next lower tier $10K CPU and know that you need just that little bit more. And then... you probably ought to be investing in scaling out horizontally while that $5K x N buys you time.
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In my experience, most companies don't think this way, but definitely should think more like this.
That said, companies that need more speed often don't need that extra speed on just one node. So that's really $5K x N nodes. When you consider that just the CPU costs $15K, and not the complete cost of a system, I think it's a lot harder to justify. You better have that next lower tier $10K CPU and know that you need just that little bit more. And then... you probably ought to be investing in scaling out horizontally while that $5K x N buys you time.