Wholesaling Contract Contingencies?

[Nicholas Hooyman]

Hi, I'm starting to get calls from my first direct mail campaign!  Curious, as a wholesaler, should I be putting contingencies into my purchase and sale contracts?  If so, which ones?  Inspection?  I'm wondering for two reasons: (1) is there a way to hedge against losing my earnest money in case a cash buyer falls through, and (2) are my cash buyers going to want that? 

Thank you in advance for your time.