uncle richard is right, it takes a good deal of time. I'd say the same amount that reloading takes if not more. Also the upfront cost is not as high as reloading but it isn't insignificant. Even if you go the most econicmal route, it will cost around $100-$150 to get the basics, and then extra molds go on top. Then lubing has different price levels, pan is the cheapest, but slowest, and then it goes up. Luber/sizers are selling on the used market for much higher than they should be, they are almost at "new" prices.
I'd look at how much time you want to spend making bullets and rounds, vs shooting them. I have more time than money and only shoot 300-400rds a month, much more than that and I'd just have to buy to save time.
Also the lead source is a big varable, sometimes you can get it for free, other times its up to $1 a pound. Wheel weights are good cheap source, also if you have a radiological pharmacy around your area, they sometimes have lead there they will sell for cheap. You have to look around. Thats why casters are sometimes scavengers, some guys pick up wheel weights off the roads when they walk to ride bikes, I'm not that desperate.....yet