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Median really is not a relevant figure here. If a millionaire increases his income by 100,000, that gets averaged among all workers. It appears that everyone is being upwardly mobile, which in fact, is not the case.
The median is the middle, not the average. The average is the average.
In your example, if everyone has zero gain and the millionaire has a $100k gain, then the average will rise. However, the gain of the middle person will still be zero. Using the median is meant to remove distortions caused by the average.
Definitions of median (n)
me·di·an [ mdee ən ]
middle point: a point, line, part, or plane that is in the middle
middle in set of ordered values: the middle value in a set of statistical values that are arranged in ascending or descending order
midpoint in frequency distribution: the value in a frequency distribution above and below which values with equal total frequencies appear
Synonyms: middle, average
Mean: The average of a numerical set. It is found by dividing the sum of a set of numbers by the number of members in the set.
Median: The value of a numerical set that equally divides the number of values that are larger and smaller.
Mode: The value of a numerical set that appears with the greatest frequency.
WikiAnswers - Define median mode and mean
I have not looked all the way through the statistics in the thread, but the only median figures I saw so far were related to percentage breakdowns of how the median family spent their income and one showing that household incomes had stagnated from 1976 to 2006. Hardly compelling evidence for your point of view.