Hey Ryan,
I lived in Tulsa for awhile and a good friend of mine and business partner lived in Sapulpa. His names Jeff Schwickerath, he owns a big flea market there, some storage units, and had a few other business ventures, maybe you heard of him.
Anyway, I'm and investor and agent, and I can agree with some of the above. Do it to find future buyers, but don't do it thinking you'll find the buyer for that specific home. I would say this is more beneficial to an agent than an investor, because you just want to sell the house your flipping. You don't care that the person that walked through wants 4 beds instead of the 3 beds in your flip. You just want to move your property as quick as possible. Now unless your doing multiple flips and have other homes you could recommend to them, there is no future benefit.
Moral of the story, you could do 400 open houses and sell 1 property. If your only goal of doing an open house is to get it sold, forget it.