Bob Sutton points out research that suggests that emphasizing money leads to:

1. Were less likely to ask others for help
2. Less likely to give others help
3. Preferred to work alone
4. Preferred to play alone
5. Put more physical distance between themselves as a new acquaintance

See the full post here.

http://bobsutton.typepad.com/my_weblog/2008/11/thinking-about-money-causes-people-to-avoid-asking-for-and-giving-help-research-in-science-magazine.html