Looking at the 611/BTC "Balance distribution" on C-CEX you should notice that there is nary a seller dropping 611 coins. The number of coins available on the "Sell orderbook" is feeded by the natural mining rate; currently about 150 SIL coins per day (declining); therefore the overall number of coins available [source: sum up the balance distribution charts] is about 27k SIL which is little less than the number of coins which have been mined since the first announcement of 611 (SixEleven) coin here on Bitcointalk.

I'm sure we are not at risk of a significant price drop at the current price level. It's simply offer and demand math.
Exactly the contrary is the case, at the current price level it's very easy to increase the 611/BTC value. Simply buy 611, the "Sell orders" will dry out shortly.