[luminarious]

For a lot of the world population, english, as common as it may be in programming, is still a foreign language. People less fluent in English are that much less likely to try scripting something. Not only would the language keywords make little to no sense, but the supporting materials and comments as well.

[TazeTSchnitzel]

Thanks to the British Empire and partly to the United States, English is effectively the international language of Business, though.