Regarding exit. People are right to point out that shares in a private company are less liquid than holding Safecoins (at least in the small amounts most individuals might invest - a few thousand pounds/dollars/euros), but…
The pitch states that 5% of all Safecoin have been reserved shareholders who want at some point to exchange their shares for Safecoin, which provides another way to exit.
I think this is actually an easy way for ordinary people to get into a cryptocurrency, specifically Safecoin. No fiddling about with bitcoin, wallets, exchanges etc. Just buy some shares in MaidSafe and later, when the network is running, take the option to convert them to Safecoin.