I suspect the nice guy in your is getting the better of your conscious.
Don't deal with that guy, and tell him straight up, 'listen, you have annoyed the mess out of me, don't contact me again'.
I tell that to people on CL all the time as everyone thinks they are experts. Thing is, I've sold over 500 instruments for over a grand, and by now I have a good idea of where things are at and what 'compromises' to go for.
People can and will say anything off of craigslist ad, but don't give them the time of day if you are a seller. There are tons of people who will waste your time, so don't mess with it.
So you know, I find selling on CL to take the longest, places like TB and harmony central or the gear page are a fair bit quicker, and ebay is really the fastest place to sell if you know where to price things and can deal with the fees. That said, I do enjoy some of the idiot responses on CL, i have fun with them. If you ever get a suspicious email asking you if the 'item is still available', just say 'the pontoon is stil around'.