Gartside told the MEN that he was disappointed at the opening day attendance of 21,753 against Charlton.
"We are extremely thankful for the 17,000 people who purchased season tickets and those who pay on the day every home game.
"But it is still disappointing that we could only achieve an attendance of 21,700 for our first home game of the season.
"While I appreciate that results are all important to our retaining casual supporters, we have improved our facilities, strengthened the team within our financial constraints and retained our Premier League status for the first time in more than 30 years.
"We believe that should help us improve our crowd averages. Our gate against Charlton was lower than four Nationwide League games and the lowest in the Premier League."