Absolutely. The issue is that by current standards, only a very small proportion of companies make it to the point where there are vibrant secondary markets for their Common shares (generally speaking at this point they have options to go public or be acquired also). Most startups don't have this as an option. I've been told by SecondMarket folks that generally speaking unless there's huge hype around a company, one needs to be at $!0m+/year revenues before the secondary market has appetite.