![Grin](https://bitcointalk.org/Smileys/default/grin.gif)
The consensus algorithm used to deploy Bitcoin (where we use mining) makes perfect sense for the first virtual currency.
However there are now more advanced methods which can be used to achieve consensus without diluting the value of each individual coin (for example DPOS).
see
https://www.youtube.com/watch?v=uo979iaLvEs&list=UUchU0j9bXOa_E1xbxB5MqbQ
I do comment on the fact that these metrics may not be hugely helpful for Bitcoin but would become helpful once we start looking at various virtual currencies or DACs.
For example we can use these metrics to compare Namecoin and .p2p (http://bitshares.org/industries/domains/) to help evaluate which is a better investment. Without these metrics how would one quantitatively decide which of the two is the better investment.