heh, I'm pretty much the opposite. If I cannot email or text the person, I'm not going to make the purchase. Phone calls waste a lot of time and are intrusive, especially in an area with spotty cell phone service. A text or email to set up a phone call generally works out better.
I do not even like to text, then they have your number, and some will keep hounding me. Even weeks & months later, texting me saying "hey I have XXX for sale, you interested?"
My experience with CL is that it anonymizes your email address, precisely to combat that situation.
Exactly why I do not like calls, or texting until it gets close to a deal.
I do not even like meeting to take a look, until I have an idea on the price. I will not bother with the "come take a look, and make an offer" Of course, I live in the middle of nowhere, and most deals are an hour or more drive.
Bad people go both ways on Craigs list. About 8 years ago, I responded, and talked to a guy selling a SB heavy 10, for almost a hour, and agreed to meet him the next day. It was up in the air at the time, if I could get a trailer. The next morning, I called and talked to him that I had a uhaul trailer lined up, and would see him at the agreed time of 1PM. I picked up the trailer, and drover the two hours to his place. When I was about 15 mins out, he called me and said it was just sold. Cost me a days work, $100 or so to rent the trailer, and the gas.
After another year of watching, I ended up buying the ShopFox gun smith lathe. A lot more money, but think I did better.