[kemayo]

Even "spent only on wikipedia" is a bit complicated -- bawolff's example was grants to Wikimedia Deutschland for work on wikidata, which sounds like it's some separate project. But really wikidata is used pretty extensively inside wikipedia, particularly for keeping facts synched up between the various project languages. Or money spent on Wikimedia Commons sounds like another random project, but actually it's the infrastructure for all the images you see on wikipedia.

It gets fuzzier as you go out to the promotion-of-free-knowledge stuff, for sure. You can argue its connection to keeping information being contributed to wikipedia, and the long term health of the community, but it's definitely less directly keep-the-lights-on.