An interesting metric would be: what percentage of coins are in the hands of people, for whom the holding represents X% of portfolio.
Gonzalo Lira explains why anonymity is so important but Bitcoin doesn't have it.
Also, actually acquiring bitcoins is remarkably complexand completely negates the supposed anonymity of bitcoin. Heres a Reddit editor discussing how tough it was for him to get bitcoins, which is fairly typical of retail customers: A whole lot of hassles, and he still couldnt buy any. And for all the talk of bitcoins anonymity, you need a whole truckload of verifiable documents making clear who you are in order to buy your first bitcoin. So the bitcoin-anonymity argument is a chimera.
The failure to meet that conditionbuy or sell exclusively and necessarily with bitcoinis what makes bitcoin essentially useless.