There are limitations on what the money can be used for. There are organizations that hold money (like JBT) that are outside of USBC control. Although the rules for use of funds are generally the same, they can be different. With USBC/Smart, if the money is not used after it expires (usually 6 years after hs graduation or when the money is won if after HS graduation) then USBC is supposed to return it back to the organization(s) that the funds originated from. This is not always easy as organizations/people who run tournaments often come and go. As for other organizations that hold their own money, they usually use the expired money to enhance their current prize funds.