Well, it's too late to take into consideration this year, but thanks for the input.
I didn't particularly care for the journalistic style of your linked Guardian article...not particularly what I'd call unbiased reporting, so I did some searching and found
Wikimedia's unaudited financial statements for the 6 months ended 12-31-2012, which do show that they are, indeed, quite flush...$33,610,040 cash ($15,455,095 net income).
I've got no idea, though, what "
why does it keep pestering you" means, because they do only one fund-raiser/year, in July, in the US, and they don't even make use of my e-mail address. (Pretty smart, actually, not bothering people at year-end when they're involved with an endless flow of solicitations.)
I've been out of accounting for many years and haven't kept up, but I thought the IRS had instituted rules to prevent cash accumulations such as Wikimedia's.