Debbie Jevans, chief executive of England RWC 2015, said the top tickets were likely to be around £715 but that high-priced tickets were needed to allow organisers to sell others for as low as £7 and £15.
The tournament organisers also have to raise a total of £80million to meet the guarantee made to the International Rugby Board. The most expensive ticket for the 2011 rugby world cup in New Zealand was £640, while the best seats for a sporting event at the London Olympics last year was £725 for the men's 100m final.
Jevans, speaking to reporters at the Sport and Recreation Alliance's European summit in London, said: "We anticipate that the top price for the final will be around that mark (£715) but below that there will be other entry prices, they are not going to be all at that level.
"You do have to have a top price if you are going to have accessibility lower down and I am passionate about having those lower prices. There is a guarantee that we have to hit and to do that there are going to have to be some high prices.
"What is equally important is that we are going to ensure that we have accessibility, that we do have entry price of £15 for pool matches and we are committed to £7. But to have that accessibility there are going to have to be some top-heavy prices."
Jevans was formerly director of sport for the London 2012 Olympics, which was able to bring in income from sponsorship and merchandise as well as tickets, but those options are not available to her for the Rugby World Cup under the system that has been used at all recent previous tournaments.
She added: "Our revenue stream is purely public ticket sales, not hospitality. All of the commercial side of it be it merchandising, sponsorship, licensing, television money sits with the Rugby World Cup as the owner of it and it also keeps the hospitality mark as well."
Friday is the deadline for applications for the 50 training bases for the 20 participating teams to use - teams may need several bases if they are in different parts of the country.
Jevans said there had been considerable interest despite the daunting criteria - a team hotel, outdoor training venues, indoor venue, gym and swimming pool - and the fact they have to be provided for free. She added: "Fifty training bases is a lot to have but we will absolutely make our 50, we have had a lot of interest."
- Sports & Recreation