I am not a member of a sorority (hopefully soon), but my outlook on the issue is: If you are passionate about being apart of that specific sorority or fraternity in question, although we are in a recession and times are hard for us all I am sure, money should be the least of your worries. It is definitely on the top ten of one's pros and cons list, but I believe in this situation the end results is as beneficial as the process along the way. Therefore, money is the least of my worries and I believe every dollar that I would put into the sorority, I am getting a learning and everlasting experience out of every dollar spent.
Hope this helps some