flipping through an agent

[William MacBride]

Hi
I recently heard of a surprsingly simple seeming idea from a real estate guru named Joe Crump. He says you can simply sign a "purchase agreement" with a buyer giving you principle interest in the property, find a rel estate agent, have them list the property on the MLS for more than what your purchase price, and sell, keeping the profit.
Any comments on such a plan?

Will