I reload because I enjoy spending the time doing it. Like you stated, it's a better way to spend time than watching TV.
I am able to produce more accurate ammo due to tailoring the rounds to my gun and choosing bullets it likes and because of the consistency of the product I produce. Every cartridge is the same and that alone gives a huge advantage to the shooter.
I've never loaded for shotguns but it seems it would be a good way to start. Read everything thing you can lay your hands on and buy some reloading manuals, they are invaluable.
Best of luck to you, jw