If there are problems with liquidity in the marketplace post ICO and there is demand from investors we have been considering setting up our own ETH-SIFT exchange where we provide a buy-back and resale service to ensure liquidity in the marketplace - infact if you dig back through the commit logs on Github this was in an earlier version of our code.  It would be completely smart contract based so there would be no manipulation from our side but there are a couple of problems with it:
1. The price we buy/sell at has the potential to manipulate the rest of the market
2. We can get seen as market making our own funds value

We decided not to launch with this but instead to be guided by investors.  The technology is pretty much (we were going to have UI on our website and an application that sits on top of Geth/MIST to make it easy to use as well) there and the question was pretty much whether or not it made sense to do.  We would rather leave this to market forces so that we aren't seen to interfere in natural pricing, and we've also had a lot of investors who have stated they are not fussed with immediate liquidity because they are treating this as a longer-term investment, but if we get a sizeable amount (and certainly if a majority) of investors that want us to provide the liquidity and some service like this we will be doing so.