I have my CMT and CFA. The CFA gets you through doors. The CMT is gaining popularity. I have meet some interesting people made some contacts, I have improved my trading because of it. It has been worth it for me.
If you don't particularly care about having the 3 letters after your name, why not study the material on your own, saving both time and money in the process? The syllabus and reading list for each CMT level are public, you know.