Rugby World Cup organisers admit high prices may have contributed to sluggish quarter-final ticket sales in Melbourne, but maintain they are pleased with overall attendance figures.

There are over 15,000 tickets remaining for Sunday's play-off between France and Ireland at Melbourne's Telstra Dome, and more than 8,000 for Saturday's showdown between South Africa and New Zealand at the venue.

In Brisbane there are less than 4,000 for the Australia-Scotland quarter-final at Suncorp Stadium on Saturday night, and about 7,000 remaining for the England-Wales match on Sunday.

The cheapest remaining tickets were $195, as all of the $95 ones had been snapped up.

Australian Rugby Union public affairs head Strath Gordon conceded sales in Melbourne were "a bit disappointing" but said quarter-final tickets were always the most difficult of the play-offs to move.

He said the Spring racing carnival had also eaten into ticket sales.

"People may have baulked at the price of the A class tickets, we're not denying that, Gordon said.

"We're still going to have almost 80,000 people attending a quarter-final in Melbourne so it's not going to do the tournament any great harm.

"At every World Cup the quarter-final tickets are the most problematic because people don't know who's going to be there and who's playing where.

"It's a bit disappointing but not anything more."

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