It's interesting the amount that some individuals choose to slag off referees for their demonstrated commitment to a sport that they referee for the love of it. They are the facilitators of the game, and you can't forget that they are an integral part of it. You cannot make a living from a refereeing wage here in Australia, so a lot comes down to the passion for basketball, and for most, they have budding careers outside of the sport. Allowing the game to flow and allowing young men in the case of the Under 18's to play physically and body-up is really a good sign that the referee's aren't trying to draw attention to themselves and ensuring that the game is fast-paced and exciting.
To answer the original question, referee's are selected on their merit and demonstrated performance throughout the season on Friday night juniors, as with all other finals. For these two referees, as was stated, they have been selected to referee at the U18 championships this year and both have a number of years experience in ABA and YouthLeague officiating.
One important thing to keep in mind is that players go out on the court and make turnovers, missed shots and they foul. That is just a part of the game. But referees when they make a mistake, even one, are slandered for their performance, particularly on a Friday night game in front of one-eyed parents. It takes a strong person to be a referee, but an even stronger one to brush unneccessary criticism off when it is non-constructive...
For those that are a fan of doing that in this state, pull your finger out and think about the effect you are having on the sport. Referees are not against the players, but presumptuous spectators and assuming coaches believe they are. If they were, they would not be out there, nor would they be allowed to be. Time to be realistic and realise that these guys and girls are just everyday people, perhaps with a bit more of a spine and personality than some of the snipers on this forum. The referees on friday nights game did not affect the outcome of the game, southern couldn't hit a shot, but they allowed the game to flow and facilitated the game whilst keeping it exciting to watch.