It all depends what they do with there money once they have it----- I never won a dime actually competting( except a $4000-00 watch at the NZ grand prix) but I have made myself alot of money through the sport of bodybuilding and its associated businesses, I have every thing I have because of bodybuilding, I own companys and property and this is all because I invested every dime I got, and i got where I got due to my bodybuilding.
Alot of pros have other intrests other than that of the compettion dollar, they invest in gyms , supplement companys etc, and these opertunitys arise because of their profiles as pros !!