At our recent Toastmasters Leadership Institute, also known simply as officer training, we discussed some of the reasons people leave Toastmasters. Although the numbers vary from survey to survey, about 70 percent leave because they don't feel their needs are being met or the club is indifferent to their needs. About 10 to 20 percent find a different way to learn public speaking. Others leave because they have personal issues with other members, some move away, and some pass away.
I think there's one reason that is often ignored. I call it the death by a thousand cuts.