I hear you, but you need to take into account that in your case it is an imported product, thus it will always be more expensive.
The same goes for me with most of the products that I get from Europe. My favorite chocolate, a brand that sells at most counters in Europe for 99 Euro cents costs here on the East Coast almost 4 Dollars + tax on top of it.
In regard to MAC, I don't think that cheaper prices would entice people to spend more. If you budget is, let's say $200/month, you won't spend more than 200 even if the product is cheaper. The disposable income is what determines how much you spend, not the price of the merchandise.
I hope this explanation - from a business and economics perspective, makes sense.
I certainly can relate to not being happy about paying more for a merchandise, but you always need to see the bigger picture.
PS: There will certainly people who envy that you don't need to stress too much over LE products selling out within minutes. So enjoy this privilege. I bet a lot of people would be prepared to pay (marginally) more if they had a few days to decide what products they want from an LE instead of being glued to the chair in front of the computer so one doesn't miss out when a collection goes live.