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Why do you help others?

Im always one to find it beneficial to help other even if theres no expected outcome for myself but why aid others in such a sport (quant trading) when you run the risk of "crowding" a trade or even the industry as a whole?Would it not be more self benefiting to keep the barrier to entry as high as possible? Unlike Quantopian that has a potential monetary gain from it via its challenges why do you help others?