You know, upvotes are good, but are not everything :I have discovered something extra that posting provides:
1/ It makes me brush up on my own knowledge
2/ I research the subject before writing, and learn a lot in the process
3/ The knowledge I bring is aimed at people that are not specialists. I love allowing other to discover new things. And for some, it makes them realize that they have a vocation for it (I am teacher... that's probably why :-) )
4/ It allows me to interact with people all around the world. Even if Internet has been there for 20 years, it never cease to amaze me...