I have a realtor friend that was explaining to me how she has seen security cameras in for-sale houses change the negotiation process, specifically Dropcams.
She told me she hates it when she shows houses with cameras, because there is a high chance something will be divuldged that otherwise upset the traditional price negotiation process.
Before cameras, realtors showed homes and regardless of how excited or ambitious the buyers really might be, price haggling was expected and the sellers would often come down if they though interested parties would walk away. Both realtors could meet and formally manage the sale price.
My friend was saying that Dropcam audio allows sellers to hear (the buyer's) realtors show the house, and overhear general reaction to things like condition, problems, and price.
On more than one occasion, the sellers refuse to negotiate price based on hearing how enthusiastic the buyers reacted, hold fast to the full list price, and the otherwise excited buyers pay the full amount.