This is not actually true, there are truly a wisen up victim that would never fall back to be scammed anymore, such ones that got continuously to be duped are fools roaming around to get some free stucks. So every victim have a mindset of turning out of been scammed by reading or remaining asking questions of how to buy to fall more victim.
They might have been wised up by the first scam that they have fallen but if there are other elaborate scams out there that that person will fall upon, I think that it will be debatable whether that person is going to fall for that scam again or not because the chances that they might be a victim of another scheme is highly likely. Maybe if the victim is a smart one in the first place, he/she may not fall for other tricks again with the rule of thumb that anything too good to be true is definitely a scam.