I'm can pretty much guarantee you the higher cost on that set is a reflection of the times, and not an attempt to adjust for aftermarket price gouging. the trend seems to be things are getting more expensive for us in general, but that was a whole 'nother discussion.
Also, since the comparison has popped up a few times (by myslef included), I want to point out the difference between scalpers ans retail stores. I know I'm stating the obvious, but scalpers buy sets at retail and add their markup on top of whatever anyone else would have paid. Actual stores - online or off - buy direct from the manufacturer at a reduced cost so that when they price the set at around MSRP they are still making a profit. If someone really wanted to make a business out of this, they would go through the proper avenues and set up an online shop of their own to turn a profit. Scalpers rely on the convince of their local stores and online shops and take advantage of not only the collectors, but the existing retail system to circumvent the extra cost of running a legitimate business.
Edit to respond to Pete: Exactly. Aftermarket price is driven by the limited availability. Don't make me break out my crayons and start drawing charts, because I so will.
Scalping has already been defined in here several times: Purchasing a set at retail to sell for profit later.
It hasn't been said like that verbatim, but that's the simple agreed upon explanation. At least, for the people that don't think it's just made up.