For example a "support" coment type, a "question" comment type, etc. Then in the backend you have choice of only making certain comment types visable to all users while keeping others hidden.
The great thing about this is that it can potentially reduce your time handling support and answering common questions since you can make the conent that other users will find helpful visable to all. It's like a self growing FAQ system.
I'm hoping theres a way to do this without kajabi. If not someone might be interested in creating a plugin to mimic the functionality as I think it would quite useful.