I don’t get it why can you do this? No one will but it’s there for some reason so I really want to know why you can.
Good question. Although, if you mention a mod, like this, snickerdoodle, you’ll get answers a lot faster. It might be because the system doesn’t filter out which comments are yours for these kinds of things, it only highlights which ones are yours for editing purposes.
I generally see people report their comment when they’re the OP and they want to ask us to lock their thread or move it or something. 
The ability to report your own comment is useful. You can tell a moderator if you want your thread to be locked once your question has been answered.