I've always compared field target to a game of golf. That one shot keeps you coming back, you are really in competition with yourself, every shot counts, there's only you the pellet and the hole, and you're the only one responsible for a bad shot.
Well, I happened across a quote from Arnold Palmer today that, imho, sums up field target...
Field Target (Golf) is deceptively simple and endlessly complicated;
it satisfies the soul and frustrates the intellect.
It is at the same time rewarding and maddening -
and it is without a doubt the greatest game
mankind has ever invented