Because you understand that the number in your bank account isn't the score of some weird game. Having more money than other people doesn't make you a better person.
If you have enough money to reach your goals - pay your rent, buy food, indulge your hobbies - that's good. If 20 other people also have enough money to reach their goals, that's a world with more happiness in it. That's a better world. So why not tell other people how to make money in the same way you did, and help bring that world about?