"NASA has managed to write bug free code at a rate of about $1000/line. If you'd prefer to work that way, we can." The simple fact is that it's cheaper to get

"NASA has managed to write bug free code at a rate of about $1000/line. If you'd prefer to work that way, we can." The simple fact is that it's cheaper to get it approximately right and fix bugs as they come up then to guarantee no bugs in the beginning.