Here's my math at your request:
1) Mold = $55
2) Handles = $23
3) Melting Pot = $45
4) Enough lube to last 10 years = $50
5) Sizer, top punch, and die = $120
5+) Everthing else I've already got, and lead & flux are free.
Cost per thousand of somebody else's cast bullets I can buy = $30
Cost per thousand of the bullets you buy = $50
Now, if I shoot 12,000 rounds per year, at the price you pay for those gun show bullets, the casting equipment will pay for itself in about 6 months. My loaded cartridges won't even cost a nickel. When you shoot as much as I do, every fraction of a penny adds up -- especially after a few years. The idea is to make the activity as affordable, and self-sustaining as possible.
I don't know what you used for a mold, or what your process was, but last year, with a four cavity mold, I could easily cast a thousand rounds in several hours -- and it was quite therapeutic for a high strung guy like me. 400 bullets is just 100 fillings of the mold. I just turn on music, get a bottle of cold microbrew, and have ALOT of fun. It's an attitude thing - and yes, my attitude drives people around me nuts. I used a Lee Production Pot IV -- which fills up a mold quickly. I don't bother hand pouring with a ladle, that would take wayyyy too long.
As for the lead fumes, I never had to inhale enough to concern me. I take a fan, place it near the bench, turn it up, and it sucks all the fumes away from the pot. I've got some ole' timer friends who've casted all their lives this way and they seem in great health to me. I'd be more worried about driving behind a tractor trailer in terms of health risk.
I agree that some folks tend to go overboard on the casting equipment -- buying $250 furnaces, $100 Saeco lead testers, $50 thermometers and such, but for a .45 ACP and 38 Super guy like me, none of that crap is necessary at all to make some great SWCs -- and really nice holes on a target.
I try to alway discuss equipment purchases like this with someone who is more experienced first. I'll make a list of what I think I need, and then let them start telling me what NOT to get. Brian Enos was able to reduce my Dillon cost by about $75.00 just by that method. When I figured it all out, between his recommendations and his discount, vs. what I would have paid Dillon directly, he probably saved me about $150 on that stuff. Hehe, now he's talking about raising his Dillon prices, so get in your orders quick if you're so inclined.