Professionally built?

In article ,
jan olieslagers wrote:

Ron Natalie schreef:

The words PROFESSIONAL and AMATEUR are not mutually exclusive.
Get a dictionary.

Sorry, but as non-native English speaker I am confused here.
To my poor bit of learning, the meanings a
-) professional: mainly for profit, some fun not excluded

Close enough. The job/work implication is the important part.

Notice that it doesn't necessarily preclude enjoying that work.

-) amateur: mainly for fun, some profit not excluded.
I don't have a dictionary handy - what does yours say?

Amateur literally derives from "lover of" something. You might get some
payback, but the love of the doing is the main point, and you'd probably
continue doing the thing with no received income.