Forget the referral fee. Another way to structure the deal to get what you're looking for--that will work nationwide--is to do this deal as a wholesale (aka assignment). Basically, what this means is that you'll put a property under contract at one price, and sell your rights to that contract to another buyer at another price--before closing.
Technically, this is a different deal altogether, because you're actually one of the principals of the deal.
The point is that your assignment fee will be the difference between your sales and purchase price. For example, if you put a property under contract to purchase for 100K, and agree to assign that to another buyer for 120K, then you'll get 20K (pre-tax) out of the proceeds of the closing.