Like others have posted, I started reloading to save money. That was almost 50 years ago, and I'd hate to see the total of what I've spent on reloading since then.
I bought my first centerfire rifle, a .30-06 from Herter's when I was in college in 1967. Along with the rifle, I bought enough basic reloading equipment to get me started. When I got out of the Army in 1971 I had acquired my first centerfire pistols, a Ruger .357 and a 1911 .45 acp, and my first shotgun, a Miroku 12 gauge O/U, and I then began reloading them. Again to save money, I began casting lead bullets for my pistols.
After I graduated from college, I joined the local Trap club so I could learn how to shoot my new shotgun. My trapshooting progressed into shooting trap leagues, and then into shooting registered trap competitions. By then I was shooting about 10,000 shotshells per year so I upgraded my shotshell reloader from a single stage Honey Bair to a Pacific (now Hornady) 366 progressive and I bought a shotmaker to make my own lead shot.
In the mid 1980s I was introduced to Skeet shooting, which led to Briley barrel insert tubes so I could shoot all 4 gauges in the same shotgun, and 3 more Hornady 366 shotshell loaders.
Somewhere in the early 80s I also acquired some more pistols, and was shooting them more, so I bought a Dillon progressive reloader to speed up my pistol reloading.
So now I won't say that I have all of the reloading equipment that I need, but my reloading bench is pretty well set up with 4 Hornady 366 progressive shotshell reloaders (one in each gauge), a single stage 12 gauge reloader for hunting shells, a Dillon 450 progressive loader, and a RCBS Rockchucker loader, plus case trimmers, a RCBS powder measurer and scale, and a vibratory and a rotary case tumblers. I'm now reloading 4 pistol cartridges, 9 rifle cartridges, and 4 shotgun gauges. I still make 2-300 pounds of shot per year, I am casting bullets for all of my pistols and most of my rifles, several different muzzleloaders, and 12 gauge shotgun slugs. I also buy all of my rifle and pistol primers in boxes of 1,000 and my shotshell primers and wads in cases of 5,000.
Most of my reloading equipment was bought and paid for many years ago, so even reloading my magnum rifle cartridges only cost me a fraction of factory ammo prices.
The other big value that I have found to reloading is that I can tailor my reloads to my guns for best accuracy and to fit the shooting that I do.