In today's world of instant communication and global socialization, who needs to join a formal organization?
All organizations offer membership benefits - a newsletter, and perhaps a magazine, devoted to that group's activities and interests; discounted costs for activities and publications; and local meetings and educational opportunities. In addition to these tangible benefits, some organizations offer benefits that affect a much larger group. For example, CSI created MasterFormat, SectionFormat, and PageFormat, which are used not only by members, but by most of the building construction industry.
"That's all fine," you say, "but what's in it for me?"