I share my code for three main reasons: 1) Other people sometimes find bugs I missed. It's like free outsourced testing. 2) The connections I make by doing t

I share my code for three main reasons: 1) Other people sometimes find bugs I missed. It's like free outsourced testing. 2) The connections I make by doing this occasionally lead to opportunities down the line. 3) Other people being grateful and thanking me boosts my ego and makes me feel good about myself. There's plenty of selfish reasons to write code that you share.