Now before you say 'duh miners of course' , I would like to ask , when people mine , they get what? 12.5 bitcoins per block? 25 btc? whatever , they get something from the 'unmined bitcoins' part .

 Why do we also have to pay them certain amount to send something to other people? If we have to pay something for the sake of involving in a technical detail which I am too far away of understanding , why are we not paying just 1 satoshi?

 Considering all the transactions everyday all day , miners probably started to make more money from miners fee rather then mining unmined coins. 4 cent could be little for one person but when all combined in everywhere , it is huge.