I still think it is a horrible idea. Exchnage should be transparent.
How is it any less transparent that you sitting with your off-order-book purchase waiting for sufficient liquidity to mount so that you can buy without driving the price up ?
Why should you be allowed to keep your hand hidden while sellers state their price in good faith ?
The hidden wall is just automating that process. In a fast market, most supply and demand is off order book anyway.
I don't think you've thought this through when you say "it is a horrible idea". I think if you did you'd quite quickly see the hypocrisy.
If you really want to take ethical trading to its extreme then ALL orders should be hidden, not shown. That way people would buy and sell for what it was worth to them, not for what they thought they could extract from the market.
Please revisit your thinking on this so that your sense of trading ethics is better informed by these various complexities
I am moving away from bitfinex permanently. 
