I am putting this here and not the marketplace section because this is not an ad. I am seeking advice on what my Mac is worth. I went to a website last night where you input what Mac you have, RAM, HD, etc. and it told me $560. I have a 2009 27" iMac with a 2.8GHz i7, 8GB RAM, 2 TB HD, Radeon 4850, wireless keyboard and mouse. I paid around $2,000 for it. I know it's 5 years old but has this model depreciated that much that I can only get less than $600 for it?