It's not just sellers who suffer because of open-for-inspections, it's tenants too.
We were renting a property that was being sold and we were told that we could not refuse an open-for-inspection being conducted every week, as well as frequent inspections in the evenings.
So much for quiet enjoyment of the property.
When I voiced my concerns about the possibility of theft, the agent told me he had never heard of robberies being committed during 'opens'. Ever.