I'm only guessing, but wouldn't anyone being paid to play, whether netball or football, go into salary cap? Disclaimer - I have not read the League salary cap rules.
Depends on the league but I know of netballers being paid.
I also know of a situation where the partner of a gun player was paid huge amounts to play netball whilst the footballer was on very low payments given his talent. The relationship broke up and she made the club continue to pay her that fee to play for the remainder of the season!!