Is Dovebid a complete scam for instruments?

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Why the hell not? 

Is there anyone who has had experience using Dovebid to purchase old instruments (GCs, HPLCs)? What's your experience been? Mine has not been very positive.

[It's like sight unseen, right? Who the hell does that? Is there a rating system? How is this not a complete scam?]

Also, should you buy a used HPLC or a used GC? I get the sense that there's real risk there, but I don't really know.