Attracting advertisers isnt that easy as you think it to be. Maybe they wont become interested in cooperation with your sportsmen at all cause they wont have an idea about the audience. Consequently, they wont be able to achieve high efficiency of the advertising campaign.
Each advertiser will be able to determine the audience of a sportsman easily cause each celebrity will have a profile with detailed info about subscribers and marketing indicators - socio-demographic data of the audience, statistics and data on past advertising campaigns.