To be fair to Wikipedia here, quoting a nearly ten year old figure and comparing it to current earnings in order to prove that their required expenses are low is not that honest.
Note I made the same argument in Wikipedia's community newspaper:
https://en.wikipedia.org/wiki/Wikipedia:Wikipedia_Signpost/2...
Read the comments from Wikipedians underneath. No one claimed it was a dishonest argument to make.
I'm pretty happy to wager real money that Wikipedia has had to scale significantly in the last ten years.
But, hey, if you've got evidence to the contrary, I'll happily read it.