it's been a while since i ran the numbers, but if i remember correctly, after the first four or five boxes of commercial (i.e. swaged) balls, you're ahead of the game if you cast. over and above that, it's fun; it keeps me out of the bars and sleazy strip clubs.
you should be able to get a decent melting pot for not too much, and if properly cared for it will last through several generations, as will moulds.
if you are heart set on swaging, you can in fact swage your lead balls. CoreBon makes all manner of swaging presses and dies, but they are quite pricey and desugned primarily for shooters who work at the zillion meter line. in all candor i must admit that my shooting isn't nearly good enough to tell the difference, so i just use cast balls as i have for many years. center the sprue and you'll be just fine.
if the sprue thingy makes you nuts, i've been told that putting them in a brass tumbler with no polishing media will remove the sprues (it mashes them back into the surface of the ball, i guess), but they don't bother me all that much so i've never tried it.
i agree that if you're shootng a brass framed revolver, you shouldn't crank up the load: you gain nothing and will eventually wear out your gun before its time.
good luck on you way to casting coolness, after which, go forth, and make good smoke!