One reason (at least in the past) to use upper ports for web servers at least is when you want to run a server, don't have root permission to use 80, so you pic

One reason (at least in the past) to use upper ports for web servers at least is when you want to run a server, don't have root permission to use 80, so you pick 8000, 8080, 8088, etc. And you think maybe you're clever and use 8089...