Making Offers on "As Is" Properties with contingencies?

[Dewain J.]

Good Morning BP. Quick Question. 

I've been purchasing properties for the past year and waiving all the contingencies on the agreement of sale. I hear people leave themselves different caveats in the contract that could allow them to back out of deals without losing earnest money and things like that. I'm just curious for those who do this, what kind of things are they specifying as a deal breaker? Since the properties are sold as is, what are you finding inspections that leads to you backing out? 

I often hear people use this as a way to send out multiple offers, without having to run around property to property, getting the property under contract, and then doing their due diligence. Is that a viable/ethical approach?