I often get stupid offers when I'm trying to sell something. Most of the time I don't mind - you don't ask you don't get plus some people will start negotiating the price low so then we can meet in the middle. When is pissing me off though is morons who offer way below fair market price and then when you politely say 'no' they keep insisting how good they offer is, how well they know the market etc.... feck off.