So you don’t think that some people have motivation beyond making money? “Public service” is used to mean a kind of calling, where a person wants to make an acceptable living doing something they believe in for the public. This is in contrast to doing whatever to pay the rent, or doing something solely for the purpose of making a lot of money. (For the purposes of argument, I’m putting motivation into three categories. There are more.)
Certainly there is overlap between the first two (actual public service, when other options may be better, and doing something to put food on the table). I don’t see much overlap between the first and the third.
My point is that there is a difference in motivation.