From Mark Suster's recent blog post on Angel Investing...
"But I fear that for most angel investors who invest over the long haul angel investing will not be a profitable endeavor. In fact, many really bright & connected people will privately tell you they’ve put much money to work and still don’t have many exits to show for it. And for some reason this seems like it is seldom talked about in the press as we celebrate every check written and every name attached to them."
It's worth a read. Here's the link:
http://www.bothsidesofthetable.com/2010/09/14/angel-investing-1-dealflow-are-you-sitting-at-the-right-poker-table/
You better adopt a different model if you are serious about real and sustainable investment success in the private capital markets.