Ok, i'll give you that maybe the top 20% of that money could be fluff for people with inflated salaries, but that still leaves 12 million.
You're talking a website that uses roughly 50 terabits of bandwidth a month, and that's not cheap consumer level bandwidth but corporate expensive bandwidth. We'll be generous and say they get a good deal and it's only 100k/year. Now we have the actual hardware.
Wikipedia is a relatively large system that has very good response time, so you're talking a nontrivial server setup
So considering failure rate and expansion of systems, since their usage is probably only going to go up, i wouldn't be surprised to see them sink a few million into regular maintenance of those server farms, such as building rent, cooling, and the system operators who run the darn things will prob add an extra mil onto it, again being generous.
So we've already located around 4 million of the roughly 12 million in non-fluff.
Keep in mind they have server locations on different continents.
Now lets add in the required overhead for a corporation, again we'll be conservative here and say they only have a couple layers plus accounting for various countries in operation. That'll easily be a million or two. Of course the buildings and support staff will probably be at least another million.
So we're up to 7.
We've covered basic site maintenance, basic corporate overhead, and basic connectivity.
Keep in mind these numbers are just for wikipedia, ignoring everything else the wikimedia foundation does.
And keep in mind, these numbers are ultra-conservative, without any expansion or growth, and ignoring staffing for multiple languages, and a larger legal department, etc etc.