If you want "every 10 second get 10 golds", it goes like this.
Event - Time, periodic 10 sec
Condition - (blank)
Action - Player Group pick everyone in All Player, give 10 gold to picked player
But I don't recommend that for Maul type of map because if you kept enemy in the game for a long time, you get alot money. Do like this:
Event - Player (number whatever it belong to enemy) becomes 0 food (this only work if you did set up every creep to cost food at least 1 or higher)
Condition - (blank)
Action - Player Group - Pick every player in (All players) and do (Player - Add 10 to (Picked player) Current gold)
But if you want player to get more gold per round, I would enhance it to something like:
Action - Player Group - Pick every player in (All players) and do (Player - Add (wavelevel x 3) to (Picked player) Current gold)
so it would be like, level 1 is over, everyone gets 3 golds.. level 10 is over, everyone gets 30 golds. BTW wavelevel is a variable, look up or ask about how does variable works.