I think it’s more like 16 million, and that’s a surprisingly small number. They have to buy a lot of bandwidth and a lot of servers to handle the load (I’ll bet it’s in the hundreds). Then add in the switches, controllers, UPS’s, halon systems, air conditioning, security systems and other hardware that goes into a server farm installation. That means an IT staff, which means managers, which means HR and payroll, and tax accountants, and secretaries to answer the phone, and…
The electricity bill alone for a large server farm can be gigantic. I managed a small server farm for a while. It had around 20 servers in it, plus all the ancillary gear. It required a 10-ton air conditioner just to keep the room cool from all the waste heat. If the air conditioner failed, it was like being in an oven that someone just switched on. In fact, it takes about half the energy to keep a server room cool than it does to power all the servers.
And with the volume they have, it probably stresses the software infrastructure as well, which means they probably have a staff or programmers, bug fixers, and QA people.
The internet’s not free, and it’s not cheap. It may look that way if all you’re doing is hosting a personal web page on Squarespace or something, but once you get into real volume, you have to start paying real money.
Here’s Wikipedia’s Stats Page. According to that, last year Wikipedia’s servers processed 53,000 page requests per second, and average throughput of about 5 gb/s. That’s a huge amount of traffic. I’d guess that bandwidth alone costs the Wikimedia foundation somewhere north of a million bucks a year, but I have no idea what they really pay.
Frankly, the fact that Wikimedia can run their whole organization on that kind of money speaks well for their fiduciary care. I would have expected it to be much more. Google burns through money so fast that 16 million is a rounding error on their balance sheet. Google’s operating budget is over $10 billion per year. Their server farms have an electricity budget alone of over $2 million per month.
Given that Wikipedia is one of the biggest web sites in the world (top 5, I believe), 16 million per year is downright frugal.