That's 95 people in 131 days, making the average cost per user $528.21 - more than what you'd pay for return flights from Auckland to Sydney.
The bus was free for passengers during the first three months and then subsidised.
To make matters worse, the bus was often late, meaning passengers missed the ferry, former Bucklands Beach Yacht Club commodore Keith Ingram said.
He told the Herald on Sunday that the club, which is based at the marina, twice called him down there to take the stranded passengers back to the carpark, as he lives nearby.
"There was no co-ordination between the bus and the ferry. At times the bus would arrive [and] pull into the car park as the ferry was pulling out. People are suddenly at the ferry building, their car's back at Lloyd Elsmore Park, so they've then got to try to get back there again to pick up their cars."
However, Auckland Transport disputed that the bus wasn't punctual, saying it was late only twice in six months.
Ingram, who is also the Half Moon Bay Residents and Ratepayers Association chairman said the officials who decided how public transport functioned were out of touch with the community.
"It's stupidity. Our town planners, our transport planners, have no idea. I don't know where they get their ideas from but they're not communicating with the community they're supposed to be trying to serve."
He was surprised at the cost of the shuttle and said the money would have been better spent on providing the marina with more parking.
Auckland Transport spokesman Mark Hannan said the Howick Local Board asked AT to trial the service.
But board chairman David Collings said the board wanted to "pull the plug" halfway through the trial because of the low usage.
"From a board point of view, we thought 'Let's not keep haemorrhaging money, let's put a hold on it'. But Auckland Transport wanted to march ahead [with it].
"I thought it was a waste of money in the first place, but we had a board member on our board that was passionate about it so I agreed to the trial. But I certainly wanted it stopped when it proved to be pointless."
Auckland Transport was "disappointed" with the service's low usage, Hannan said.
"People were not willing to transfer from their car to a shuttle bus despite publicity in local media and advertising in the area. We tried something new but local people did not change their commuter habits."
He said Auckland Transport had no plans to retrial the bus service. Instead it would focus on working with rolling out a new public transport network.
