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The extra cost is well justified since
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Buying a new pump is justified if funds allow, but if not, buying a VFD is not justified.
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Some new Dell servers have an option to disable PFC in the BIOS. Even in a commercial setting, there are places where the power factor improvement is not worth the loss in efficiency, even though new server PSUs are very efficient to begin with.
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This is an "eco" forum. Where are you looking when you say "efficiency"? For someone with this line of thinking, what you said is correct! You're just indirectly calling power factor requirements bunk. As quantities of harmonic producing loads like CFLs and LEDs increase, the total demand distortion is increased and lowers efficiency.
You therefore, increase "carbon foot print" coefficient by lowering distribution efficiency in addition to wasting capacity of utility infrastructure. The 180% 0.5% 2kVA 1kW input VFDs do a great job of compounding onto this problem.
