I have been trading on Bid or Buy since 2000 and in that time, only accumulated one negative rating from a customer who thought her local Post Office should have kept her parcel for 6 months since she was too lazy to fetch it. This was reversed upon a request to the Mods
On AVF it is slightly different since we are mostly selling used equipment and overall, people are more reasonable with their expectations. I have seen a few grumbles and even received one myself when a courier mis-handled a tape deck between CT and Jhb
But what would be reasonable justification to issue a negative rating?
Equipment in a completely different condition than was described? Maybe damaged requiring repair or not working at all
Equipment that was slightly different from what was advertised, ie: Cable model ABC-1 and you sent Cable model ABC-2?
Someone who promised to buy an item, undertook to pay and then did a duck and became silent?
A seller being tardy in posting off an item that he had been paid for?
Some other reason?
I have read posts from people complaining that they had submitted a request to buy ahead of someone else, yet had not won the item. Surely it is the seller's decision to whom he sells his product? I would rather sell something (especially is it is large and heavy) to someone who could come and collect, instead of waiting for a courier to turn up