Hello~. 1a. The word amateur is a complex one. By one meaning, it indicates limited skill and amateurishness, as opposed to professionalism. Yet its older meaning comes (via French) from the Latin word love (l’amour). Thus the word can mean doing something for the love of it, as a pastime perhaps, but with dedication. (from Korea high school English book) I think the but is being used for the emphasis of comparing with dedication with as a pastime perhaps. Am I right?(Therefore, the but can be ommited.) Thank you as always~.