Are we talking about the volume or available for sell ? Your initial investigation was about the amount of Quark available for sell and I've taken few minutes to see the exact figures.
Some facts(not opinion):
btc38.com total quarks available for sell: 1,631,344 QRK (http://www.btc38.com/trade_en.html?btc38_trade_coin_name=qrk)
cryptsy total quarks available for sell: 347,410 QRK (https://www.cryptsy.com/markets/view/71)
bter total quarks available for sell: 332,711 QRK (https://bter.com/trade/qrk_btc)
Only taken the 3 most important exchanges, total QRK available for sell: 2,311,465 -> out of 248,233,803 total QRK ~= 0.93%
Bitcoin top 3
BTC China : They don't present the order available for sell to non-registered users but I've taken their volume of 30,000 BTC
Bitstamp: 4,000 BTC available for sell(https://www.bitstamp.net/market/order_book/)
BTC-e: 9,554 BTC available for sell(https://btc-e.com/)
Total 43,554 BTC, out of 13,303,700 total BTC ~= 0.32%
Bitcoin available for sell almost 3 times lower than Quark.