I joined a professional association once. Over the course of several years and thousands of dollars, this is what I had received for joining: a useful PowerPoint on writing press releases.
That’s all. Obviously, that relationship didn’t last too long. The press releases I’ve constructed since are better, I suppose. Worth my investment into the organization? Eh, nope.
Ask someone why they join a professional association and they’ll offer up networking, educational opportunities, certifications, or representation. All important and vital functions of any association.
Then, ask someone why they won’t renew a membership, or why they’re not interested in joining at all, and they’ll tell you it’s because they didn’t see the personal value in it. There’s just not enough in it for them to justify the expenditure.