TBH, that 3x increase in expected hosting cost (33/11) doesn't seem bad to me. Maybe Wikipedia has a lot more redundancy now, maybe their pages load faster in more countries, maybe they're using external cloud providers instead of running bare metal, maybe they host more stuff that doesn't get as many page views, etc. (For example, I'm pretty sure I could host HN off my desktop computer, but I'm sure it's hosted in a safer way than that.)
How many employees is the right number? Is "1" the right number, is "300" the right number? How does Wikipedia's growth compare to other well-known companies?