I think maybe because the 10+ years in jail thing is only "real" if they're convicted, and which NRL players have actually gone to jail for that long? It's almost a completely theoretical scenario. BUT, players have for sure had their contracts torn up, or been suspended, and even if they've been found not guilty, have been questioned and charged for pretty serious crimes. It's a "real" scenario, which will deter players from even putting themself in a position to be implicated in a situation. I think that's what the NRL's plan is, and they've said as much. Telling players to not do illegal stuff is useless. But getting through to them that using anything less than absolute caution in all situations can STILL result in serious penalties.