They collected weekly revenue of at least S$1 million.
Seet, who earned profits of at least S$19,000 a month, spent about S$150,000 of his ill-gotten earnings to pay off his mortgage on a three-room condominium unit in River Valley.
Another 54 similar charges were taken into consideration for sentencing.
He will begin serving his sentence on April 11 and remains out on bail of S$75,000.
Afterwards, they personally and actively recruited other agents and shareholders who would collect 4D bets from punters on their behalf.
They avoided detection by the authorities by personally interviewing prospective members and only accepting those who agreed to their terms.
In 2013, Seet learned about a more efficient online betting system in Hong Kong.
He profited at least S$5,000 every month through this site from 2013 to his arrest.
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