Because no one figured the easy way to do it, also known as the clones trick, once the word got out even Konohamaru managed to do it.
There`s also the fact that is not particularly a really known technique and is more or less limited to one tree of masters/students line.
You cannot hope to build a better world without improving the individuals. To that end each of us must work for his own improvement, and at the same time share a general responsibility for all humanity, our particular duty being to aid those to whom we think we can be most useful. -Marie Curie
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