Most scientists experience first hand that science was built by all the previous scientists and that their purpose in life, as a scientist, is to continue building the culture of humanity.
All scientific papers acknowledge some of the previous papers upon wich they build.
Humanity's culture has given you so much, why not give something back ? And you may even live long enough to see what you gave being improved by others, which is one of the greatest satisfaction.
You can get much more than what you give. This is like a relationship with someone who has a very big potential, namely humanity.