The point is not that the auction winner will actually go COD, its just a way of rooting out scammers.
No scammer is ever going to allow COD, not a chance, and if you live a thousand miles away you are not going to do this anyway.
You ask about COD before you bid, and if you choose not to bid, you lose nothing, and there will be another seller along soon enough.
The only ones likely to accept COD will be highly likely to be genuine sellers, once you have established that, then you move on to paying for shipping.
Lots of people find that the buyer paying on collection works out, there is less risk of transit damage and all the accusations that can flow from that, and there isn’t all the hassle of packing something and getting it to the shipper, on largeish objects, and especially large fragile objects its a real help not to have to worry about shipping.
You can spot scammer articles fairly easy, but usually you also lump some honest sellers in, or you are not too sure.
So if you are in the market for taking a chance on someone who looks perhaps iffy, but might not be, it could be worth it, because whatever makes someone look suspicious to me, will make them look suspicious to others, and that will push the price down.
If someone emails you from a proper ISP account onstead of a free email account such as hotmail or yahoo, then its a good sign, that’s not to say Hotmail EBAYers are all crooked, its a number of things that add up to form a picture.