Day 1. Post item for £1100
Day 2. Have reply from buyers assuring you that they will take it for £300, as a similar power second hand desktop could be put together for less. Also that they do not need it and really are doing you a favour by taking it off your hands.
Day 3. Refusal of offer and lower the price to £1000. Counter offers of £400 accompanied with statements that attack the worth of your item. Further assurances that not only do they not need the item, they practically don't want it!
Day 4. refusal of counter offer. Buyers say that they will offer no more than £405, they have a family to feed and anymore will cause little Timmy to starve, something that he cannot justify as a dissimilar product was bought on gumtree for near the same price. This is teh final offer they tell you!
Day 16. Buyers reply asking you if it is still available. Your moral has been worn down and you are a broken man. You get a second final offer of £407.50 not including postage, something they want insured and on 24 hour. You can't abide by this as it costs a bomb. They say 'no problem, i can wait on 48 hour deliver'
Day 20. Buyer lists laptop on ebay and sells for 900.
Day 22. Buyer opens up a dispute with paypal