"It's being driven by two things - by the consumer who wants more interesting taste profiles but the other thing driving craft is the retailers who want more margin," he said. "They're not making anything out of a $20 pack of beers, they're making more money out of one bottle of Moa Reserve."
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He said increasing numbers of free houses - bars that were not associated exclusively with either Lion or its main competitor DB Breweries - was also a factor, with such bars wanting to offer a wider range of beverages, including more craft beers.
Ross' comments come after Lion Breweries, which has 46 per cent of the liquor market and is owned by Japan's Kirin Holdings, released its full-year sales figures to the Companies Office, showing net profit was down 20 per cent.
Total revenue for the year ending September 30 was also down from $611 million the year before to $564 million this year.
Last month, Lion chief executive Stuart Irvine said Australian and New Zealand consumers were drinking less alcohol overall than at any time in the previous 15 years, a statistic mirrored by government figures showing the total volume of beer available for sale in New Zealand had been falling over the past 30 years.
Total beer sales by volume fell 2.3 per cent to 282 million litres in 2014.
Ross said the move to craft and premium beer had already been seen in the wine and spirits sector, with beer the last to go through this change.
"Wine was probably first about 25 years ago and then cocktails, or the reinvention of cocktails," Ross said.
"So rather than just vodka and orange juice, people started realising there were better flavours in the spirit world, and that was probably 10 years ago and now finally it's got to beer where it's no longer just a lager and an ale, there are now all sorts of different styles."
Ross said craft beer made up around 5 per cent of the market but was expected to grow to 10 per cent in the next few years.
More craft sales
• Overall beer sales volumes are down but craft sales are up.
• Total beer sales by volume in 2014 fell 2.3% to 282 million litres.