You know one has asked this question of @MacDre and @Ellejustus . Why do your girls HA
These players sign a contract for the funds or investment with return. There can be a clause that if they do not pay the investment back they owe the group money. So if they do not do well on the PGA they could be in a world of debt. It is private loans so to speak.
Most performer (athletes, singers, authors) contracts I have been made aware of are a gamble by the promoter - the signing advance and actual expenses can be taken out of future earnings and thus make things lean for the performer for a while, but there is no obligation beyond that. If they quit and get a job as soda jerk, that is their income to keep without declaring bankruptcy.