The quickest way to turn an enjoyable hobby into drudgery is to make a business out of it. You will quickly tire of
HAVING TO make some bullets to fill an order.
Then IF it takes off and you get a bunch of customers, you will not be able to keep up. That is unless you spent a ton of money on automatic machines to crank out a lot of bullets. Gone will be the use of scrap lead to make bullets. You just about have to get the lead direct from the smelter, then you can specify the alloy so you can offer different hardness, BHN numbers, to your customers.
Check out this operation at Missouri bullets;
http://www.facebook.com/missouribullet
http://www.thehighroad.org/showthread.php?t=608703
When you get shipments of tons of lead every month, you have some volume. When you get a bunch of machines like Brad has, you can be AHEAD of demand so you can ship the same day the order is received. He's famous for 2-3 day shipping using flat rate boxes. The P.O. picks up his shipments in a big truck that he loads with a forklift.