What is a reasonable fee a buyer agent for owner finance

[Joe S.]

So I sell properties from time to time with owner finance. Whereas I typically never get over 10% down and sometimes less what would be considered a fair fee to an agent that brings me a buyer that needs owner finance? I realize the standard for most buyers agents on a transaction is 3%. However a lot of their buyers do not get approved for a loan and a deal falls through on many occasions through a traditional sale. With these owner finance transactions it is pretty much a guaranteed closing. Has anyone else used agents for this sort of thing? I typically find my own buyers, however I’d like to spend more time on my other parts of the business instead of focusing on selling and meeting buyers. 
Any insight?