Speaking for myself, I would rather buy with the confidence of a reliable warranty then save a few bucks and gamble.
I have bought a good sized Canon outfit(FD lens mount) that I enjooy ussing.All fromKEH at various times.
When I use the equipment and look at the photos, I forget the cost of the equipment but enjoy the results. I DO NOT want the hassles of the unknow coming from who knows where and the non photographic work of sursing the computer to get in the best bid.
I just order, pay and use my equipment.