In whatever sport of field of endeavor you are interested, you should do whatever is necessary to compliment your God-given talent with proper mental preparation so as to do "the best you can." The criterion should be to fully exploit your potential rather than to win at any cost. What more could anyone ever ask of you than to be the best you possibly can?
I once heard that Paul Seymour said as much as winning an NBA Championship, he'd like to see the Celtics lose a game after Auerbach brought out the cigar so he could go up to Arnold and stuff the cigar in his face.
My biggest win was getting the meal money bumped from $5 to $7.