There's been a lot of discussion regarding buying experiences on EBay. But I've recently begun to sell photography items on EBay. I'm surprised at the number of problems to be encountered with the process as a seller.

Perhaps I'm expecting too much. Problems I've encountered:

Non-U.S. bidders on auction where "US only" explicitly stated.

Zero feedback bidders on ads where "NO Zero Feedback Bidders" explicitly stated.

Winning bidders who don't establish communication within 48 hrs after winning an item, against terms of the listing.

Winning bidders who don't make themselves available to sign for their UPS packages in order to facilitate closing the deal.

And last but not least, one non-paying winning bidder who phoned me and made personal threats of a stalking nature because the item went to someone else on a Second Chance basis due to his lack of communication with me after auction close.

And all this in my first 5 sales! Am I doing something wrong? Or are your experiences as a seller similar. What communication timelines, payment timelines, etc do you consider acceptable?
On average, how long does it take to completely close your deals?