I think you underestimate how much halves are worth on the current market,while 2018 brooks wasn't really elite he was at least a solid first grade half.Brooks' 2018 (I think you mean 2018) form is still not nearly worth $750k. It's the biggest myth in football.
We came 9th and scored the second least points in the league apart from wooden spooners Parra. They won 6 games and score 374 pts. We scored 377.
He was average that year. He got a bunch of Dally M points he didn't deserve. We won close games in fluky ways and we were among the worst teams in the comp that year and our attack for most of the year was quite pitiful - in large part due to Brooks' impotence. He has been reserve grade standard for the majority of his career and his career highlight was a season where he was generously, maybe the 7th or 8th best halfback in the league.
He is simply not worth remotely close to 750k. 300k to be a backup half and potentially play some 14? Good with me. But 3 years at 750k a year is a deadset joke for a guy who would struggle to make first grade at any other team in the comp and most certainly not for any team that has a serious desire to play finals footy.
Granted brooks hasn't played anything close to that since 2020 so hid market rate is probably around 500k give or take a 100