I cast because it's another aspect of the reloading/handloading hobby that I enjoy immensely. I get great satisfaction turning a stack of lead ingots in a shiny pile of perfect little bullets.
The money savings aspect is another big reason. And finally, having bullets that fit your gun perfectly is priceless–a custom fit and the correct lube makes for some pretty accurate shooting.
And if some very basic safety rules are followed (which needs to be the case 24/7) the chances of being poisoned are next to impossible.