Reloading is an enjoyable hobby just like others have said. Every hobby has it's costs, radio controlled boats / planes, street cars, fishing boats, etc, etc. I very much enjoy knowing that "I" made what I shoot.
Like others, consulting work could easily pay for factory rounds instead of investing my time and labor into the effort. But, I'm also the kind of person who will paint my own house rather than hire a painter, buy the miter saw and install wood trim rather than hire a carpenter, change my car's oil and brake pads rather than go to a mechanic. It's simply the satisfaction that I did it myself. You can't place a price on that.