Sorry Sir
When it comes to second-hand items, there has always been a nature of haggling down the price, no matter what the item in question happens to be. Granted, online marketplace’s make it somewhat more difficult for this to happen when you don’t actually get to see the person.
So when people try and haggle something down in a rude way, without knowing the person, there is almost no chance the person on the other end is going to be so kind as to give you the discount. Especially not if you start at such a ridiculous asking price…