I originally stumbled upon this little clip from a WSJ article on Sam Huleatt's blog http://www.leveragingideas.com/. Its a great blog and I encourage you to read it...

These facts on angel investing from Entrepreneurship Professor Scott Shane are not only enlightening but shocking! :

Prof. Shane notes that only 21% of angels meet the Securities and Exchange Commission's requirements for being an "accredited investor" – or an individual making $250,000 annually or more, or a couple making $350,000 or more (or net worth of more than $1 million). What's more, the majority of angels don't end up making money on their investments, and only 2% of businesses they invest in eventually become IPOs. And only 15% of angels do "extensive" research on the sectors of the businesses they fund.

The median angel investment is around $10,000, Prof. Shane finds.

-Via the Wall Street Journal