Currency 2 is useless ??
I think yes....
I just played some game and everytime my team mate was buying this cur2 and they seems to doesnt know whats the difference. This upgrade doesnt need to be "purchase" because 2 more gold every sec = 2(gold) x 60(1min)= 120 and 120(gold)x10(mins)= 1200. So, you will get 1200 MORE gold in 10min. So why take this. In 10min u can get this gold by killing creeps, getting a kill, etc. Get exp1, priest, wait for angel or buy better equip. This thing cost 3k. You can get nice equip with that 3k. The only time you get cur2 and to get cur3 for the 4 more extra gold instead of only 2 extra gold. Just hope ppl will thing about this.