This is a FPS and has somekind of MMO aspect game.
People acumulate gold to spend in gear and get experience points, to level their toons and heirloom items.
So my sugestion is to keep the game balanced for a long run, and for people that want a fair balanced game enviroment, and for people that can play only 1-3 hours/day.
The first 3 hours of game every day, people get a bonus x3(Gold and XP) that acumulate with normal round bonus.
This bonus would not penalize people that can play all day long, but
can contribute to lesser the gap between college/kids and etc.. with people that have normal jobs and family.
So it would be like powerhour in some old MMOs, and would not be hard to implement.