When I started selling California real estate as an agent in the 1970s, my specialty was 7-day owner-financing escrows. By using owner financing, we didn't rely on a mortgage lender and all of the shenanigans, jumping-of-the-hoops, that obtaining a mortgage entails. Sometimes, I even sold owner-carried mortgages to hard-money lenders and closed those transactions simutaneously, if you can believe that.
I was paid a commission, generally from both sides of the deal, plus I often picked up at least 50% of the discount points for selling the paper. It was a pretty lucatrative business, and I started in real estate by closing about 10 transactions a month. I thought that was how everybody did it. Only years later did I realize that most transactions are conducted nothing like this, there are fiduciary relationships to consider, and we were never going to close an escrow within 7 days again.
You can read more in my personal blog today about What If Sacramento Real Estate Sold and Closed in 3 Days?