It's like people used to say about micropayments; all these little knobs exact a mental cost; I have to spend 5 cycles deciding what to do --- mod up? mod down? what are other people doing? do I need to care?
Seems to me like Hacker News is doing the Simplest Thing That Could Possibly work. A good thing.
Wouldn't it be simpler to automate the whole thing, and let the algorithm do the work?