Quote: ebay automatically opens an unpaid item case after four days. Send payment reminders.
eBay does this only if you have set it up in your seller settings. I have this in mine, and in the last year only two buyers did not pay before
ebay sent them the "reminder". One paid, and one never did pay. The one that didn't pay got a "strike" on their account.
On a side note, you can put buyer IDs into an exception to the automatic unpaid item case. This allows those good customers that want to try to win auctions ending more than four days apart without being bothered by
ebay to pay up.
Many buyers don't know that they can put BIN items into their cart to avoid having to pay for each item separately due to the immediate payment requirement (if the seller has that activated). I don't use immediate payment required on my BIN listings but if I did, I might include a sentence such as "If you want to purchase several items at once, put them into your cart first, then pay when you are finished shopping."
I have been selling on
ebay on and off since 1999, and I have found that the less "rules" you put into your listing the better.
Adding rules that are already part of
ebay's normal operations is just redundant and unnecessary (such as, "if you bid and win, you are expected to pay.")
Adding rules that are not part of
ebay's normal operations is just going to scare away potential buyers and can not be enforced. You might get some to comply, but you are probably losing more sales than you know by having such rules.
EDIT: This reminded me of a seller many years ago that had this in their terms of sale: "If you leave me a false negative feedback, you agree that you are legally bound to pay me $2,000 as damages to my reputation".