I didn't do much farming; I mostly ran around trying to cap turrets. Why did I have another 2k gold every time I went back to base?
Does my team gain gold every time an enemy champ dies? Or every time we cap a turret?

the map has increased passive gold gain...

u get like 27 gold per 10 seconds or so

gold goes up by like 5 a sec

the map itself gives you buff, it shows were your buffs/debuffs normally are and tells you what stats have been increased. Off the top of my head it gives you passive xp and gold and some other stuff...

You get 6 gold per second on Dominion.