Don't take my comment to be against the idea, it's great to be honest, I'm simply not the target market - however there are quite a few more wealthy, entrepreneur and silicon valley types on here who wouldn't miss a few hundred dollars in tipping.
The idea is definitely a good niche and if I simply had more disposable income I would use it - don't let me refusal discredit it in any way.
Bitcoin would be pretty useless if you couldn't break it up into smaller pieces, especially at the current prices. =) It is divisible up to 0.00000001 (8 decimal places) and the total number that can exist is 21 million (which hasn't been reached yet).
I'd definitely give it a try. I don't know whether it would fit HN as nicely as it does Reddit, but there is just one way to find out, isn't it? :)
edit - I also wonder how it would evolve on HN. I could imagine using it here not for tipping, but for crowdfunding of sorts. With so many vcs reading this group, I'd expect people throwing 1-2BTC at a time at good ideas/ShowHNs to support some of the entrepreneurs.
If the minimum tip size is big enough, it would be a Very interesting contribution to any thread... let's say $10-20 USD. That's enough to make it socially relevant.
thanks for your thoughts.
i wasn't that worried about my bitcoin purchase being on record more that i wanted some immediately and didn't want to wait 3/4 days for bank payment to clear etc etc.