Just for fun, I calculated some numbers from BITCOINDARK (BTCD) RICH LIST – TOP 500 (http://explorebtcd.info/bitcoindark-btcd-rich-list-top-500/)

Here's some numbers as of 12/21/2014 10:00 PM EST:

- Total number of BTCD : 1196483.84897169

- Amount in the Richest BTCD Wallet : 70703.08461362 (5.90923853 % of Total BTCD)

- Sum Amount in the Top 3 Richest BTCD Wallets : 148386.17967444 (12.40185397 % of Total BTCD)

- Sum Amount in the Top 10 Richest BTCD Wallets : 314404.72249349 (26.2773896 % of Total BTCD)

- Sum Amount in the Top 25 Richest BTCD Wallets : 516369.06835077 (43.15721176 % of Total BTCD)

- Sum Amount in the Top 50 Richest BTCD Wallets : 725975.85766507 (60.6757758 % of Total BTCD)

- Sum Amount in the Top 100 Richest BTCD Wallets : 944918.99597922 (78.97465534 % of Total BTCD)

- Sum Amount in the Top 500 Richest BTCD Wallets : 1187075.64221826 (99.21367875 % of Total BTCD)

And below are how other coins' rich lists look like:

BTC
https://bitinfocharts.com/top-100-richest-bitcoin-addresses.html

LTC
https://bitinfocharts.com/top-100-richest-litecoin-addresses.html

DOGE
https://bitinfocharts.com/top-100-richest-dogecoin-addresses.html

PeerCoin
https://bitinfocharts.com/top-100-richest-ppcoin-addresses.html

DC
https://bitinfocharts.com/top-100-richest-darkcoin-addresses.html

Hope you enjoy this!