obviously people have different preferences on contact method, the important thing is to let the buyers know the one you prefer to be contacted by in the listing. I also prefer email to random calls from people I don't know. but some people never check e-mail or don't like people giving it out and prefer phone calls. I have sold off and on with craigslist, furniture, battery chargers, kids stuff, I have had good luck with people showing up when they say the will, I think cash only is the best way to do business and most people I think understand that. I have had more frustration trying to contact people that have stuff for sale and them not getting back than vice versa. If you want to sell something put in pictures and get back to people that contact you the same day, if it is a common item they can find elsewhere they will move on and maybe buy elsewhere if you don't get back, I know I do.