"You won't find their names on the front (door) but the hard reality is that Chinese junkets are largely controlled by triad societies."
China tightly controls the amount of money individuals can take out of the country, with a limit of 20,000 yuan ($3,262) per day and citizens traveling to Macau, which is considered a special administrative region, are subject to these limits.
However, China has turned a blind eye to the abuse of capital controls, said Vickers although he added, this could change as the country's new leaders look to crack down on corruption amid worries about officials funneling money through the city.
Macau government officials did not immediately respond to a request from CNN for comment.
The triads are also said to be involved in prostitution rings, another bone of contention for local Macau residents -- although prostitution is not illegal.
Macau is on a U.S. State Department watch list for human trafficking and according to the 2012 report, criminal syndicates are involved in recruitment.
It says many women fall prey to false advertisements for casino jobs but upon arrival are forced into prostitution.
Many of the city's sidewalks and underpasses are littered with prostitutes' calling cards and fliers for saunas and pole dancing clubs.
"I don't know how to explain this to my children," said Huang at the Macau Polytechnic Institute.
Authorities are keen to diversify Macau's appeal and turn the city into a broader entertainment destination that attracts families and not just casino goers.
New resorts boast attractions like wave pools, fake beaches and high-class dining but there's little evidence that sales of spa treatments and slap-up meals will ever begin to approach revenue from the gambling tables.
"I don't think promoting a more family-friendly environment will be easy," said Huang.