I've been playing this game for a year now and i don't think daily mission is doing that much especially those who are f2p... asides from raid, campaign events and event quests. Don't get me wrong here but daily mission is fine it's just that it is not enough in the current state of super mechs where base is implemented, expensive offers and upgrading stuff....
My rewards suggestion is here as it follows (basically daily mission rewards but more)
Finish 30 campaign mission - 50k gold
Obtain 200 items - 45k gold
Win 30 arena battles - 100 fuel
Boost using 150 items - 50k gold
Finish all campaign missions - 70 token
I calculated them based on their original daily mission rewards × 10 but his is just my suggestion... share your opinions, and critics here..!