Less support trouble, less costs, and the troublemakers go away.
Of course, I would never tell straight to my customers that if they don't like a feature they can go to h3ll, but guess what, thet are not going anywhere else.
Now, if the service is low margin and low volume you can't afford losing customers. But if you have high margins, high volumes or a combination of both then a community that gets to vocal becomes a PR problem.
Think about gaming communities like Eve-Online... would you want your business be dictated by too angry and too vocal customers?
Those are not customer anymore, are a cost and costs must be purged.
Of course being frank about it makes one look like a bad guy, things that is happening here.
Nonetheless you have to break eggs to make an omelette.