It's already fairly easy to make money.
Voting: $500 each IRL day
Mining: $1k-10k per hour (Sell stuff at /shop or to other players. The ammount of money you can earn per hour increases if you level up your mining skill)
Grinding pigmen: $5k-21k per hour (Visit a pigmen grinder, most large towns have one. Salvage all your golden swords into ingots on a goldblock using MCMMO and sell all of it at /shop. The ammount of money you earn per hour here increases if you level up your salvaging skill (This is a child skill, level up fishing or repair to gain salvage levels.)
