Remember, best case scenario is that your backups play zero games in first grade. How much do you want to be paying those guys?
Obviously teams use more than 17 players in a season. The player in any given squad who plays the 18th most number of games generally plays 12 games (half the season). So obviously you need him to be worth considerably more than minimum salary. The rest of your backups decline in value from there. Can you reshuffle your team so you bring in player 18 rather than a backup at a specialist position? Or are you forced to bring in a specialist half when one of your starters is unavailable? This is what determines how much you should pay your top backup half. We already have halves options in our 17, including Gutherson and Takairangi. We've probably offered Dargan a spot on minimum salary because that's what he's worth to us next year. But he could be holding out for a better offer from a club more in need of a backup halfback. You can't stockpile players any more. Even the Broncos had to let Ash Taylor go.
Yeah this is very true. Someone like a Dargan will consider a new home in future as Norman and Moses are recently signed and young so unless he forces his way into the team or plays as a 9/14 he wont have a lot of opportunity. He would probably stick it out for a year or two but then look for somewhere else once he has had some exposure I'd say.
As a back up though would you prefer Robson or Dargan. Dargan has potentially more upsides but he is not proven while Robson is.
If dargan doesn't see a future here in a year or two he will leave irrespective of the money we offer because other teams can offer more opportunity and hence more money lonf term