$20k is really a pittance in the scheme of things, in the context of the running of a even semi-professional football team. Was a bit of a bizarre thing to do. Perhaps he was trying to subtly send a message that Victory were really neglecting their women's side otherwise it doesn't really make sense. If you were truly wealthy you'd give a lot more than that. I'm not a wealthy person but I spent that on an elective surgery once.
It's full year salary for one of the players, remember they are on a small coin.