6% for $600k

Interesting idea.  I've definitely had this thought before.

"Three entrepreneurs are offering a share of their life’s income in exchange for cash upfront and have banded together to form the Thrust Fund, an online marketplace for such personal investments.
 Kjerstin Erickson, a 26-year-old Stanford graduate who founded a non-profit called FORGE that rebuilds community services in Sub-Saharan African refugee camps, is offering 6 percent of her life’s income for $600,000.
“So many friends are in the same boat as me — they’re struggling along, wanting to see so much more from their organizations or to let them fly on their own. But it’s hard not being able to get out of the daily grind and raise what you need for payroll,” she said. “The Thrust Fund is appealing because it lets me fast-forward a couple years.”
Erickson said she’s close to signing a deal within the next few weeks and is already fielding several potential investors. A back of the envelope calculation suggests that she would have to earn roughly $250,000 a year after taxes until she turned 65 for an investor to break even, excluding inflation and the opportunity cost of investing elsewhere."


http://deals.venturebeat.com/2010/03/03/life-investment/