Next, because a small bug introduced in development, and not cleaned up, can often cause an order of magnitude more trouble in the field. So a gain of 15% in rote development stands to save 150% later on. To put it another way, a colleague once humble-bragged he was a good enough gambler he was net-positive on his junkets to Las Vegas. I requested he subtract the costs of hotel rooms & meals. This is the framing problem; when you frame some data and analyze it, then switch to a larger frame and reanalyze, the answer might be very different. Pair Programming has immeasurable benefits beyond the low bug rate & clean code.
~
My mind to your mind. My thoughts to your thoughts... -- Mr Spock