Proprietary Deal - Saving on elimination of realtor and broker fee's

I'm negotiating on a manufacturing business that I found through a banker intermediary. The sellers are retiring and first went to their long time banker to pass along their interest in selling. They would like to sell the building and business together. Now, in Real-estate if you come across a residential deal where there are no realtors involved, it's common to propose splitting the 6% commission a seller would pay if they went through the MLS. In this deal, the realtor fee's on the building would be 5%-6% and a business broker would charge 6%-10% for the business.

Is this same practice common in acquiring a propriety deal?