In all honesty, he didn't say strictly monthly payouts. He said:
What if instead of a daily payout, we got paid only once or twice, or several times a month?
That could mean each 3, 5, 7, 10, whatever days. How about passing this parameter on the password field or elsewhere (if it isn't too much trouble to support on the trading scripts), and let everyone set his own tradeoff between profitability and waiting time for payouts?