Mac users pay more than Windows users for the same things, given a choice:
"When online travel agent Orbitz admitted in June that it was steering Mac users on its site toward higher-priced hotel rooms, many were angry. But another company is finding that Mac users will pay more than Windows users for an identical product -- even when allowed to choose how much they pay."
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And, a propos of this, from the same article:
"One widely quoted set of figures, attributed to Forrester Research, claims that adult Mac owners have an average household income of $98,560, compared to just $74,452 for PC owners."