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I like the comparison with the Bhurj Khalifa. If we take 10x as the metric, that would be 15 Billion (based on an estimated 1.5 Billion for the Bhurj Khalifa) which seems in the right ballpark.

Another way of looking at it, is that the Bhurj Khalifa is an arguably pointless vanity project by a small but wealthy state. Building a Great Pyramid replica could be a pointless. vanity project for a slightly more wealthy state. Maybe that's all the original was, a vanity project for a wealthy state

I've also seen some arguments that the pyramids and other monuments were de facto public works programs, as it was a source of paid employment for farmers during the slow months of the year, and the same construction efforts would have gone into the roads, quarries, central housing, etc to support the staggering amount of manpower needed.

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