Every protection product you sell carries underwriting profit. Premiums come in, claims go out, and whatever is left over belongs to whoever holds the risk. Under a standard arrangement the store takes the commission at delivery and the provider holds the rest.
Profit participation gives the store a share of that result. It fits naturally, because the store influences almost every variable that decides whether those contracts perform. You choose the products. You decide how they are presented. Your service department handles a large share of the work that turns into claims.
A participation structure lets the store earn on that work over the life of the contracts, not only on the day of delivery.