To clarify, yes it takes more power than a single Pi. But for any projects where someone would be running _multiple_ Pi's, then the power usage is close if not equal. These machines are able to run the workload of 3-5 Pi's with roughly equal power budgets of 3-5 Pi's.
There are a number of machines using 5800u @ 15W. That's hardly 10x more power. They are only slightly bigger but offer a quite a bit more performance, let alone features.
That said, what am I talking about costs about 500. There's some overlap but it's not exactly the same market.