Maybe lot's of people have blocked you?
Oh man, one of my biggest frustrations. When I was coming here I sold most of my household items and furniture on craigslist. People would email again and again, I'd send more pics, we'd set up a time for them to come over and be ready and they wouldn't show. If they did come, they'd start haggling on the price we already agreed on, or start trying to offer half the price for half the item (I don't need the dish in the microwave, so how about I give you 15 instead of 30!). It was insane. People are idiots.
I haven't bought that much online on this site, but when I have it's been mostly good. Except one time the girl who I talked to about buying things wasn't home and her boyfriend acted like it was news to him and wouldn't sell me the stuff at the agreed upon prices. It was a hassle because I had not gotten similar things from someone else due to this deal and I had to take 2 buses just to get there. As I looked up our emails on my phone he called her and she denied it, too, until I showed him the emails. Then he wouldn't even open the door for me as I carried the stuff out. People are idiots. I think it's important to remember that people are idiots.