I bought and use one of their lighter models as my daily driver. They weren't so expensive before the supply chain disruptions but I agree they are nominally expensive. My motivations were primarily to free my computing as much as possible and to bolster the security of my already hardened system design.

I do not feel the computer is any faster or slower than my previous x86 systems, so I guess that can be painted in a good light so far as it works well enough that one wouldn't notice. The only thing I have encountered is 4K video playback can be a bit slow. Something with the altivec implementation that is beyond my comprehension. And not all packages are built for powerpc in every distro so I also find myself building certain programs from source, mainly games.

The takeaway: I bought for freedom and user control rather than for power and performance.