I would however listen to the advice/warning and respond back to the text that you have read it and understand it.
Be wary of anyone who does not appear to be interested in the goods you are selling, or who does not ask any of the questions you would normally expect for the type of goods, e.g. about the condition or any warranty. If the seller offers you more than the asking price, and asks you to send on some of the proceeds to him or to a third party such as a relative or a courier company, it is a scam. The scammer uses this ploy to send fake checks/cheques and it is the overpayment element that he is interested in, much more than the goods. He is hoping that your bank will not notice the fake until after you have sent off the goods and the money.