The short answer is because I can. Both as a producer and consumer I favor the lesser environmental impact, cost and aesthetics of the outdoor grow. There are those who categorically prefer indoor grown herb. It reminds me of a neighbor in blue collar Boston who when asked if we might take some beautiful Bosque pears that were abundant on their tree, said "Sure, take 'em all, we don't eat 'em because they haven't been sprayed." Mr Natural had some good pear eating that Fall. If you categorically prefer the indoor grown herb would you share why?