Just how important are fitness goals?

... What is it about fitness goals that keep us focused?
... Do those who have specific sports-related goals achieve them because of their focus?
... Must there be a competitiveness factor, an event, a competition involved?
... Why is it that some champions enter cycling races, body building contests, marathons, or other competitive events?
... Must we always strive to do more -- running faster, being stronger, jumping higher than we did the last time or against another?