The flipside is the economy on hardcore is a fucking wasteland and you can be looking a long time for well rolled rares and shit. But yeah no scammers there or at least not many.
To be fair though unless you're selling/buying The Doctor or 6L big ticket uniques, you don't run into the scammers too often either on softcore. And if you do deal with these, spend a week reading reddit and you should be well aware of the common scams since they're posted constantly. The basics is, if the other guy cancels the trade, your scam detector should skyrocket. Sometime I cancel cause I didn't split my 10c into 3c for a map, but for a high price item that shit's a big red flag. Double that if the guy is trying to argue on the value of ex in chaos(like you put 160c but he says .8 exalts are worth 162c on an 8exalt sale, that fucker's about to give you some stinker after you get your 2 additional chaos). When buying 6L, double check it is actually a 6L, the common scam is 4L+2L, with some chests having the graphic kinda look like a link too(qotf iirc is pretty big on that).
When selling, make sure you actually check how many exalts are in the window, same for chaos, some people will drop 1 exalts or 1c in the middle of 10stacks. For the exalt it's also common by doing the cancel trade shit, they give you 7exalt for your Doctor for example, then cancel then put 1exalt and a bunch of chaos and if you're too quick to accept, you got fucked. Then again people have started dropping other cards in the trade to scam the scammers, basically drop some shit card and get an exalt for it, easy money.
Really pretty much all scams rely on you not spending the extra 5secs to check the item they put in the window, that you have to hover on anyway. No one's gonna cancel a trade because you take 10secs to inspect the item before you agree on the trade(well besides scammers), so just take the time. Obviously if it's some 5c shit doesn't matter but when you're buying 1ex+ shit you should pay attention.