Bwahahaha, only just seen this. True, but saving 85 - 90 credits over 18 holes makes the wait less painful... ;-)
Sorry, my turn to miss a post for ages.
A more serious point, that must make gaining credits in brackets very difficult.
Take the100c 18 hole. First round -190, second -280, semi -82, finish second +404 and win +980. So using fairly expensive balls only the finalists gain, I see why you play free balls when you can. Better on the 9 hole and 200c of course but maybe tougher opponents.