Yes. I would. A newbie account trying to sell an amazon card that requires you to go first? The sirens must be so loud your neighbors can hear them! $25 value for $8? What a good deal! Except... it's probably not, and just a clear scam. I might understand $20 as the pricetag... but you can get lots of everyday things from Amazon regardless, so I don't quite understand. The $8 would mean that it's probably either a scam or the card was bought with illicit funds. Either way it's not worth the purchase... not to say that higher price = higher quality
Atleast they have this thread to look at and a redtrust to see on their profile from KWH to look at. Cause I was not privileged enough to have these blaring signs to warn me not to touch this user with a 10 foot pole.

They don't need a thread to warn them if the user already looks like a scammer.
And this is right to you?

I'm not saying that it's fine to scam, but you have to place a degree of blame on the person who was scammed.
If I were to sell a stolen credit card to someone, would you say that the buyer was never at fault during the entire scenario? I'd hope not... otherwise, we would have bigger problems to worry about.
Though this example is not a great analogy (comparison between credit cards and other items) you could replace it with other objects that are faulty in some way and it still drives the point: the buyer should be wary about what they're buying. I wouldn't just respond to the first used car sale and buy it instantly. I would check the car for any damages.
(Or in these online cases, usually there
is no car.)