I agree with previous posters that POS minting could tie up some coins and cause delays, although they shouldn't be minting with a large portion of the coins to make them reliably available for withdrawal.
However, I still find the trading activity at Vircurex very hard to explain as rational by any actor other than BTC-e and I'd like to hear what other think of that.
Heres an image of their one month price and volume chart as well as the total number of 24 hour trades made in each coin:
http://imgur.com/obNtcyvDoes anyone else find it strange that the PPC/BTC trade pair regularly has more trading volume than all other trade pairs at Vircurex combined? Why would someone who wanted to buy 20,000 to 50,000 PPC most days choose to use the very illiquid Vircurex market instead of the liquid BTC-e market? They end up overpaying by raising the price as their large market order is filled. The only way I can explain it as rational behavior is to suggest that it is BTC-e covering their short position.
Ill like to remind you all that there is reason to be suspicious:
balthazar (novacoin dev) sent btc-e a 100k bribe to accept the coin. btc-e provided proof that they destroyed the coins though, yet they still keep nvc on their exchange.
http://www.reddit.com/r/ppcoin/comments/1chzq8/does_novacoin_pose_a_threat_to_ppcoin/BTC-e has had and might still have a very large stake in NVC, which is the primary competitor to PPC. This gives them a motive to suppress PPC through short selling.
Anyhow, as a result of these regular buys the Vircurex market has responded by placing lots of sell orders on the order book, so that in recent days Vircurex has become fairly liquid. I would encourage you to move your trading there or to Crypto-Trade so as to avoid leaving deposits of PPC at BTC-e. I still believe its likely they have short sold the PPC market on BTC-e and will be forced to cover their shorts if people withdraw their PPC. It cant hurt to try it and find out if the price reacts.