Determining rent rate via Craig's List

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I'm currently researching areas that would work for SFH rentals.

One thing I've been doing is looking up deals online (mostly REO/fixer uppers) and then making fake Craigslist ads advertising the property to see what sort of response I get and what rental rates people seem open to.

Two quick things: I never post details on the properties like street address or anything like that, and I never respond to the emails I get.

I'm merely testing ads and seeing how much interest there would be in a certain property and would it rent for enough to make cash flow positive.

Any thoughts on this, and does anyone else do the same thing?