Since real estate commission is 100% negotiable, for sellers it’s just easier to lower the listing fee so the rebate is built in and then it can be offered in any of the 50 states to sellers.
A steady flow of buyers and sellers is what makes an agent successful. Most agents that are not successful in the business, don’t have the steady flow of business coming in.
Real Estate Rebates come from the commission that is typically paid by the seller or builder. Since real estate agents sell most of the new construction homes for builders, there is almost always commission factored into the pricing of the builder.