From the day one, somebody told me that our vote has no value do we don't need to upvote other posts. That's why I don't do upvotes.

Who said to you? Why didn't you ask us about it :))

Your upvote might not have value in $s but it is very precious for us. If you give 10 upvotes in a day, we would be happy and i am sure it will return you some curation too. Whether it is $0 or not :))