However I was referring to using "Zillow data" in .XLS format, which is freely downloadable, and performing various manipulations of that data using those tools mentioned, to extract some insightful info.

You than have both parties sign a release extracting the investor. 

By suggesting too much which fundamentally is interfering they could try and extract some financial harm from the action.

So for example an investor say gets a 7 cap for a purchase but after tax benefits can extract into the double digits.

That said, if you want to dig into REO's, especially ones in Chicago, and you want to extract en masse, I've got some knowledge there that I am always willing to impart.Or, you could just put all my offers for me and rake a handful of slam-dunk commishes off 1 investor every month.

Also, probably more than a lot of the rookie wholesaler/flippers that hear about theses deals, think they just throw together some contracts, extract a fee, and walk away to let the parties fight it out when something goes sideways.It's usually riskier for the buyer, since if the seller can't/won't perform, his money may be in the seller's/wholesaler's pocket already.

Also even if you get a judgment you have to find them to collect and it can take years to extract a little money if at all if they file BK and wipe out your claims.

Josh and Brandon to an excellent job of interviewing successful investors on the site and extract a ton of great information.

You could extract rent multipliers from recent sales that were tenant occupied or sales that were converted to rentals afterward.

There are several methods used by appraisers to extract rates of change from the data to be used for the adjustment.