That is true but one point, the supply increases exponentially where as the demand does not. Lets look at cars most car manufactures do not have massive increases in production every 2 years. Breeding snakes if we said a simply recessive trait starts with one visual animal then in 2 years we could have say 5 visuals then in 2 more years 15 visuals in 2 more years there could be 30 more, So in six years you could have gone from 1 to 36. The next two years could see 70 or 80 more that isn't unrealistic. As supply increases demand increases but not at the same rate. Competition kicks in and the price drops.