Since revelius, everything has become much more expensive. So it would be normal to earn more gold than before Revelius, which is true for quests etc. But this has not happened with minigames. You still get the same amount of gold as before Revelius and that kind of makes minigames not really worth playing for people who want more gold. So I think it would be better to have minigames give more gold, that way they become more attractive too.