Some people use it as a crutch. A crutch (which is a tool) to help them stand when dealing with the addict in their life is causing them to feel like they can't stand on their own.
Some people use it as a tool to enhance their own recovery and to learn from others who are farther down the path.
There are two other reasons that were not questioned so let's address them here.
Some people use it as a means of performing their Step 12 work, sharing their ES&H with others.
And some are here for their own personal amusement.
gentle hugs
ke