And I don't understand a blanket statement like yours. It depends on the equipment you purchase, the availability of components, your skill as a reloader, the caliber being reloaded, the number reloaded per year, and the lifetime of the brass you use. It CAN be cheaper IF you are shooting some of the handgun calibers like 45ACP, .44RM .357M or .38SP. I bet it is tough to reload the same quality of 9mm for a price lower than it is sold for on sale, what seems like multiple times a year by different vendors. When I was shooting handgun, I reloaded everything except for 9mm and .40S&W. Reloading them was throwing money away, I couldn't buy the components, not including the brass, for what I could buy new bulk pre-loads purchased on sale.
Reloading for rifle is tougher. I reload because I can reload ammo which works in my rifles far more accurately than any I can purchase. Is it cheaper? Maybe. I went from knowing little, to knowing a lot about reloading high power bottleneck cartridges over the past 10 plus years. I have also upgraded my equipment (and rifles) at significant cost, and added equipment at significant additional cost in the eternal quest for better accuracy. With 5K plus of .223, about 6K plus of .308, as well as about 2K of 300WM, and now closing in on 2K of 6.5CM, I can say I may have finally broken even between buying some of the best factory pre-loaded match ammo at bulk on sale and making my own in their respective calibers.
If I was doing this to shoot less than 20 rounds a year out hunting, including a few sighters to get the scope on target, then buying a box or two at CT or wherever would be FAR cheaper than reloading. It all depends on your wants and needs.
Most reloading is fun and interesting to do as the results are so variable but you as a reloader get to have control once you discover what they are. Bulk reloading for handgun is pretty boring. Saving money reloading is possible under the right circumstances.