why so many languages

wouldn't it be better if there was only one language like c++ or c#
then programmers could spend their time mastering that language
instead of re-learning the basics of another language every few years

>>41
i like money.
i like being productive.
i like to live comfortably with nice food, a good computer, in a big house.
i don't want to live on the street and i have no interest in being an RMS clone.