It's explained on the signup page here. $725 pays for the WTC entry fee. The other $725 goes to the Ironman Foundation.
This means IM makes the same profit out of this slot versus any other. It also means that the other $725 is tax deductible and will go to the charity, Ironman Foundation. Of that $725 the charity receives, a portion will go to the expenses of running the foundation and the remaining will be put towards good causes.
So let's say [hypothetically] Ironman Foundation expenses run at 50%, $367.50 of the $1450 will go to good causes. I've just made up that 50% as an example
This means IM makes the same profit out of this slot versus any other. It also means that the other $725 is tax deductible and will go to the charity, Ironman Foundation. Of that $725 the charity receives, a portion will go to the expenses of running the foundation and the remaining will be put towards good causes.
So let's say [hypothetically] Ironman Foundation expenses run at 50%, $367.50 of the $1450 will go to good causes. I've just made up that 50% as an example