[bertil]

I believe that your being down-voted for writing:

> But it's a stupid, wrong solution. The basic idea sucks. It's bad.

instead of explaining that the cost is the cost of guaranteeing the authenticity of the transaction. HackerNews likes technical comments, and will happily burry expletives.

You could find more compelling example, such as estimate the ecological cost of having most of the current world-wide banking transactions on BitCoin, and prove your point.