Many of us who bought 5D MK III at 3499 needed that camera ... we do not care if Canon decides to drop the price after a few months, so many others can also buy them. From what I can understand in your post is that you could have waited for the price to drop and did not really need the camera when you purchased it ... but if you really needed the 5D MK III and bought it at $3499, you have nothing to crib about. Canon are smarter than you think, they sold 5D MK III for $3499 because they knew that there was a demand and sure enough they were right. The official price drop for 5D MK III is only $500 ... you cannot blame Canon if some grey market outlets or limited special deals are selling it for a lot less.
Moral of the story: next time do not buy things when you don't need them. But if you do need something and paid a premium for being one of the first few to get it, then do not crib.
One of the best posts on this thread.
Just one quibble however: the official price drop for the 5DIII is not $500. At least not in the U.S. I think Canon would argue there has been no official price drop. However, given that they have offered a never-ending rebate of $200, I think one could legitimately say the "official" price drop is $200.
All other price drops have been driven by individual retailers, who are reacting to the market.
The reality (which I cannot understand how the OP, who claims to have some knowledge of economics, cannot understand) is that Canon is at the mercy of the marketplace. If the 5DIII has fallen in price since its introduction, it is not because of Canon, it is because the market has determined that the fair price is different than what Canon set as its target price.
This is one of the the things that real economists refer to when they talk of the magic of the marketplace. In a capitalistic world, Canon gets to ask for any price they choose, but buyers then get to tell them "yes" or "no." It appears that a significant number of buyers have said "no" and retailers (the front-line soldiers of capitalism) have responded with price cuts. I can't imagine why anyone, outside of tinfoil hat conspiracy theorists, would object.