Fake Listing to Test Rental Price?

[John Woodington]

On the last podcast, the guest said he created a fake listing for a rental he was thinking of purchasing, essentially to test the waters to see if his monthly rate estimate was correct or not.  Is this something others have tried?  I'm planning to rent out my house once we move out, but I want to know ahead of time how much I can rent it for.  Is there anything unethical about creating a fake ad for my own house just to see if I can get a bead on what it will rent for when I do in fact rent it out?