Jenga,
Unless you are going to make a lot of them, it definitely costs more money to start up and pour. You won't recoup your cost for awhile. Mold about $35, lead pot about $60, lead ...free if you can find it, hooks, gate cutters, paint if you are going to paint them, eyeglasses, face shield, fan for circulation, toaster oven for curing paint. This is just a general idea. I'm sure I missed a lot.
However if you want a hobby to keep you busy, then go for it, learn and most important be very careful so you don't get burned.