I love Bitcoin. It is great for the free market, the voluntary market. However, I am against this idea because HN is our fun, not our job. Some things does not pay with money. Have a look at this: http://www.voxeu.org/article/blood-money-doesn-t-pay-new-evi...
And have a look at this nice thread: http://meta.stackoverflow.com/questions/25615/offering-actua...
At that point (Dec 2012) I thought Stack Overflow should accept bitcoins as bounty, but I was convinced that it isn't a good idea.