Rather than worrying about an open house, you whould be worrying about attracting the 85+ percent of buyers who search for and find their home online. In order to do this, you have to execute an excellent digital media marketing plan.
Good question. On a scale of one to ten I, for purposes of selling a property, an open house would be about a 3..That being said, you property should LOOK great from the time the pictures are taken until the time escrow closes. So if having an open house is what it takes to have you get the home in showing condtion, that is great.
You should know that about 90% of the time the buyer that sees the home they buy for the first time, sees it with a Realtor. So I would be more concerned about how many showings you receive by agent, or agent referrals, meaning on an open house a properly marketed and priced home will receive quite a few buyers who will say "my agent asked me to stop by and have a look". If you are not receiving those showings, with individually or at an open house, then you and your Realtor need to talk.