theres nothing wrong with possible vs probable matches or games against barbarians, just don't do it during another competition like the NRC especially in the final round when finals qualification is on the line.
Funnily enough, I was thinking yesterday about the old North Harbour vs South Harbour games. You are probably too young to remember them, but they were pretty enjoyable. Given that there were two levels, just about every first grade player got a game!
The first encounters I can remember, North Harbour was composed of Norths, Gordon, Manly, Eastwood and Parramatta, South Harbour was Sydney Uni, Randwick, Easts, Drummoyne and St George.