To be honest, as much as I've slated Matchroom, it's easy to see why they've made the fight financially. And props to Brook for snapping their hands off.
Vargas has report fly been demanding huge money to face Brook.
Plus, it's worth remembering the parallels between these two fighters. Both probably the best in their division (in GGG's case, he definitely is) but both denied that big fight they desperately want (Canelo and Khan respectively).