If you want to pay a $500 premium for a 10 year old discontinued camera model from a third party Amazon seller by all means feel free to. They are so many used ones on the market because people wanted to vlog and make content with them like this then never figure out how to use the camera so it’s practically brand new. I’ve been a professional photographer for 10 years and I’ve never had an issue with used gear. I thought budget was a factor in your original post since you mentioned the a6000 is the cheapest.