Thanks everyone.
Here is what I've found.
Every single call is a potential deal. Out of my 230 or so mailers, I've had 3 calls total the first week. The one in Lakeland, FL that turned a ghetto house into $1500 cash in my pocket, the call from Kissimmee, FL that has a $10-25k flip potential, and one message asking to take their name off the list (which is better for me because I don't want to spend anymore money marketing to people who have 0% response rate anyways).
Just be light and conversational to your sellers and buyers
You make your money on both ends of the deal, so negotiate the heck out of your seller's price (but be respectful and don't risk losing it) and use a realtor to give you true competitive comps on your sales price so you have supportive evidence for your price and cant get haggled too far down by your buyers, because they will try.
Every cash buyer on my list wants their deals to be acquired at 70% of market value, including purchase and rehab. Do this for them and they will keep coming back. Even if they don't buy the first or second time, theirs always the third time, etc. And if you're bringing deals like that to their ballpark, you won't have any problems.