some people on Audiogon.com are selling audio components that are recently released or near mint condition or fairly new models of gear sometimes at 1/2 price? Is it safe to buy anything from there? Why would anyone buy some of this stuff and sell it at 1/2 the price? I don't see the logic or reason. and in the descriptions they say nothing about the history of the product or why they are selling it or who/where they are at? etc..... any thoughts?