Rules posted by Andy Dehnart of Reality Blurred
http://www.realityblurred.com/realitytv/archives/survivor/2010_May_31_survivor_rules

A. 5.
Contestants are prohibited from making sharing or making any agreement to share all or any portion of the Prize (or from making any other similar quid pro quo agreement whereby one Contestant receives a benefit or some form of consideration whether money or otherwise) after the Series has concluded) with any Contestant or any relative of any Contestant, or any representative of or any representative of or person affiliated with another Contestant in any way.

Such prohibited consideration may take, without limitation, the form of sharing the Prize or other prizes, or the form of purposefully losing Challenges in exchange for money or employment or consideration of any kind to be received after the production of the Series.

Evidence of any such sharing or agreement to share or any other quid pro quo agreement, or the breach of any other Rule by a Contestant, may, in Producer's sole discretion, result in that Contestant's expulsion from the Series location and competition and/or that Contestant's forfeiture of the Prize and/or any other prizes, even if already awarded.