In Bitfunder there is people that bought at the original AMC IPO at 0'0005 so they are probably more willing to sell at 0'004x that people on BTCT that started buying at a higher price.
Very true. Additionally, there are about twice the amount of shares on bitfunder (of which about half of those IPO'd at .0005-.0008). In the beginning, .5 btc bought 1000 shares and now buys about 100 shares. There's a lot of people on bitfunder that bought these really cheap shares. Another thing to think about is the amount of speculative liquidity on btct compared to bitfunder. There have been a lot of big IPO's on btct recently that have a lot of volatility. For someone that wants to chase the volatility, it's easier for them to stay on one exchange to keep their btc most liquid. When actm gets good news, they'll buy it quick rather than try to send to weexchange and waste valuable time.