I pay promptly on ebay. Most sellers seem to ship fairly quickly but this year I have had too many that never ship and never reply to emails 7-10 days after I paid and see they haven't marked the item as shipped. Kind of weird since I have been buying for 10 years with little problems.

There are quite a few mentally unstable people in this world and cheap computers and internet access seem to have them spilling over the ebay and craigslist lately