Ignore the crazies. People who don't bother actually reading the entire ad don't deserve a response.
We have delivered things for an additional fee at times, but we have access to a trailer and a vehicle capable of towing said trailer, so it made sense for us to do it because hey, we got our stuff sold that way, and the delivery fee was fair. However I would never deliver anything without someone nicely offering a delivery fee first. If someone just TOLD me to deliver it, especially without realizing that this costs ME labor, time, and money and not offering to compensate for that, I'm not dealing with them anymore. That kind of entitlement just tells me that I'm going to show up and they won't be there, or will have changed their mind, or want $50 knocked off the price for this or that. People who feel entitled to free delivery of used items from a random stranger aren't going to be reasonable people.
We've had some great experiences buying and selling on CL, but we just ignore people who refuse to read the ad completely or become totally wishy washy or ask too many inane questions. It's a used item people. There is some degree of risk in that. If you want something new and perfect, go buy it new.
It never ceases to amaze me what will sell quickly and what doesn't. I am shocked that we quickly sold two used cheap twin mattresses. I thought we'd never sell those. Yet we are having a hard time selling our old living room furniture that doesn't have any damage at all. I don't like the set, hence why we got a new one, so maybe no one else likes it either...but i can just never predict what will sell. I thought for sure we'd sell those couches before used mattresses! And someone even bought the world's ugliest kitchen cabinets when we tore them out and redid our kitchen. I told my husband he was crazy for thinking anyone would want them. They were gone in 2 days. I find it all very fascinating.