Gil Simon wrote:
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But what if I can't understand my own code even if it was well documented a week back :(

This is a contradiction: if it was WELL documented, you could understand it. The quality of documentation is not measured by word count e.g. "push acc;save accumulator on stack" adds 4 words of comment but does not make the code any clearer; however it can be beneficial to have something like "; on exit:n; acc savedn; r1 contains binary equivalent" in a routine header.
Re.: many to code the same, some may have the time to code and test a program for demo purposes, I, for one, do not.
Erik