Police have not confirmed whether illicit alcohol was behind 15 incidents at hospitality venues across inner Melbourne since April 14, but the industry is warning Australia's high excise settings is fuelling organised crime.
Two more Melbourne hospitality venues were attacked in the early hours of Saturday, as police investigate whether they are linked to the broader spree.
A Molotov cocktail was thrown towards a licensed venue on Cecil Street at South Melbourne about 2.20am.
About an hour later, the glass doors of a Docklands restaurant were smashed before accelerant was used to set it alight, police said.
Three males - aged 16, 19 and 22 - were arrested in relation to the Docklands attack while no alleged offenders have been identified for the earlier incident.
Detectives from Operation Eclipse will investigate whether the incidents are linked to the broader spate of attacks on licensed venues.
If the alcohol excise is left unchecked, the nation could face a second black market scourge, after the explosion in illicit tobacco that has decimated the federal budget's excise take and spurred gang violence.
The experience of the tobacco market was a "cautionary tale", industry body Spirits and Cocktails Australia chief executive Steven Fanner told AAP.
High excise rates equate to more than $30 on a standard 700ml bottle of spirits.
Mr Fanner warns the excise is interacting with the alcohol manufacturers remission scheme - a tax break intended to support craft distillers by allowing small manufacturers to produce their first 8500 litres or so excise-free - to do more harm than good.
The system is being gamed by dodgy operators and opportunistic middlemen, who are exploiting the scheme to buy up tax-free alcohol and undercut genuine manufacturers.
Spirits and Cocktails Australia and the Australian Distiller's Association have written to the treasurer outlining their concerns over the scheme and calling for stronger integrity measures to ensure it isn't exploited by bad actors.
They estimate tightening the scheme could save the federal budget about $224 million over four years.
Last November, the Australian Taxation Office estimated illicit alcohol sales were worth at least $767 million, which was more than 10 per cent of all spirits consumed legally in Australia, said the National Drug Research Institute.
A spokesperson for Assistant Treasurer Daniel Mulino said the alcohol remission scheme was about supporting Australian distillers.
"We take integrity very seriously. The ATO is responsible for compliance and we expect them to crack down on anyone who is doing the wrong thing," the spokesperson said in a statement.
Police were aware alcohol could also be coming into the nation without being taxed, said Victoria Police Detective Superintendent Jason Kelly, although it wasn't clear whether the attacks were the beginning of an illegal alcohol trade war.
"That's the million-dollar question," he told reporters on Tuesday.
"Everything is on the table."
But Det Supt Kelly suggested unknown crime figures were employing the same techniques used in the state's long-running tobacco turf war.
Nationals MP Pat Conaghan wants a review of the alcohol excise, which he says is unsustainable for operators and drives consumers to the black market.
As a former undercover drug operative, he believes enforcement agencies are severely under-resourced and penalties are far too low to act as a deterrent.
Mr Conaghan says there is still time to "break the back" of the illicit alcohol networks before they become entrenched.
"If we don't get on top of it now, it will turn into the same kind of monster that tobacco is," he said.
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