Valuable reasons for re-inventing wheels:

• You apreciate what others have done before, and what is polishing the results. (4 x. doing it user friendly, or error proof).
• You find yourself that 'you are not the only one' :) And you could measure the public success that your idea could have become if you had done it some time before.
• By comparing the code (thanks to opensource), you can improve your syntax and the way of procesing the data.
• Finally, you can clasify your chunks of code and re-use them in other projects. You need to improve your self-documenting style, in order to reuse it with just a glimpse at it and not having to inspect it in detail. Also, re-structuring it in clear chunks would help a lot!

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