Why is IO so much more expensive?

TheHim May 1, 2015, 1:41am 1

Why is it that a bottle of IO is $120 whilst a bottle of IS is $40?

Topic		Replies	Views
IO: why has the price gone up to $119, and when will it be back to $39? Men's Pheromone Advice & Field Reports	0	285	January 21, 2012
Crazy price jump? IJ + IO Men's Pheromone Advice & Field Reports	3	859	April 13, 2012
instant openness price Men's Pheromone Advice & Field Reports	8	974	June 28, 2013
Instant openness increase twice in price? Women's Pheromone Advice & Field Reports	4	1060	February 10, 2012
IO worth the price tag? Men's Pheromone Advice & Field Reports	11	1215	December 12, 2012