I'll take a bite on The Rocks bait. My cousin was a recent captain of South Sydney and a premiership winning player at Easts, which in Rocks view might give me some cred.
My nephew was signed up by a league club at 15, two years after entering an agreement along with his parents to accept regular payments for special dietary requirements. (In view of the ASADA affair I must add that the dietary requirements were strictly a balanced diet provided by the club dietician in order for the nephew to grow strong with a fair muscle cover during his 14/15 year growth spurt.)
He was from outside a small country town, and it was expected that he would move to a specified school for the last two or so years of school so he could receive coaching and advanced physical training under a supervised diet, whilst playing U16 and U18 competitions. It was expected that he would move on to the national U20 competition after school.
At 17 he was injured, and then homesickness, distaste for city life, and all the things that can affect a youth from the bush caused him to return home. By then the local RL club (like a number of them locally) had folded so RU or soccer were the only options. He took up Union but only very socially, and retired from the game at about 26.
Rugby Union in the central west and northern riverina is booming, albeit at a very amateurish level of play among the smaller towns. RL on the other hand is dying, such that there are at least twice as many defunct clubs as functioning ones, and those that do function are struggling, teetering on bankruptcy, relying on imported players (paid) that do not return anything like enough through the gates to pay their way.