Reloading is worth it, even just for the fact that you will spend more time shooting, thus becoming a much better shooter.
Plus, it's lots of fun experimenting with different powder/bullet/seating depth combinations to find the right load for your gun.
Never mind the fact that it's very rewarding to bring home meat killed with your own custom made cartridge!
It's definitely not less expensive than just buying a box of factory ammo every year or so.
But as someone mentioned earlier, it's a great hobby within a hobby.