Punters believed their money was being placed on horse races and they were earning lucrative annual returns.
"Emails were distributed to the syndicate leaders, prompting them to continue to deposit funds," Ms Andrews told the court.
"He sent out rather fulsome emails indicating what horses bets had been placed on.
"Then sends another follow up saying, 'This week we have had a win'." But the prosecutor said these were fraudulent promises.
The syndicate collapsed in late 2013 when members wanted to cash out, and some lost more than A$1 million.
Vlahos previously faced a multi-million dollar civil lawsuit over the punting club's collapse and he declared bankruptcy in December 2013.
He is due to return to court for a mention in November and a four-week committal hearing has been scheduled for March 2018.
- AAP