The price of Olympic participation has risen sharply since the 1984 top-level sponsorship fee of $4 million - and is likely to continue its ascent.
The studies emboldened the I.O.C. to raise its sponsorship fees for the next four years.
The ride, which was started in 1979, costs $50 to enter, with sponsors allowed six participants as part of their sponsorship fee.
After paying a sponsorship fee of $35,000 last year, the company raised its contribution to $55,000 this year.
"The sponsorship fees enable us to produce a meeting of the proper caliber."
Boo.com generates revenues by charging merchants sponsorship fees and from advertising.
The sponsorship fee for his star was raised entirely by fan donations.
They do not pay the sponsorship fee.
Half the sponsorship fees go to the Japan Sumo Association, and half to the winner.
Jeanne Phillips paid the $15,000 sponsorship fee for the star and its maintenance to honor her mother.