Anyone who thinks you can make math justify reloading isn't very good at math. There are lots of really good reasons to load your own, but none of them include saving money.
I day do it. It's absolutely fascinating.
I must politely disagree, for my total investment to start loading .444 for example;
-lee 50th anniversary kit $135
-100 pieces new rem brass off the EE $70 shipped to my door
-300 bullets $110 shipped to me
-300 primers $15
-.444 dies $40
-
2 lbs reloder 7 $70
Total of $440 to startup and make 300 bullets, or 15 boxes of 20 .444 marlin.
To buy 15 boxes of pre-rolled from remington or hornady at $56 a box would cost me in the neighbourhood of $840 by my math and would make owning/shooting this gun financially unfeasable for me.
Even if my cost calculation was off by several hundred dollars which it isnt, and i paid myself $100 for the 6 hours it would take me to load up 300 rounds it would still become cost neutral in under 300 rounds, but my numbers are dam close making the production cost neutral after roughly 150 rounds.
Of course this is the cheap way i pursued but it works. if you are going to spend hundreds or thousands of dollars on high end gear like RCBS Lyman, Redding, chargemasters, tumblers, and all the bells and whistles to reload for a 308 or 30-06, of course it will take you years to amortize the cost of startup.
So i wouldnt say that saving money is not a good reason to reload, its just another one of many great reasons to start.