I had missed the idle consumption. That being said I guess if they are that energy conscious the next question would be why aren't they shutting down their computer when not in use.
People building home servers aren't a big customer base. In other words, you don't really matter to them.
And even if we're talking about datacenter GPUs power usage should be a relatively much smaller issue than for CPUs because of how expensive they are e.g. depreciation for something like the H100 (assuming it actually starts losing value any time soon...) is more than the power + cooling costs anyway.