These scammers leverage one one's vulnerability to be able to exploit their victims. I know many will be talking about those without enough knowledge being their targets, while that is true and could form a larger part of their targeted audience, even the knowledgeable ones and experienced people can be their victims too. Being careless with the way we operate our transactions sometimes due to our undue comfortability and overconfidence in our professionalism do bring about vulnerable conditions that make us fall into victim.
When dealing with funds and initiating transactions, it is good to always trade with care and exercise patience with the process. Being too hasty brings about vulnerability which is just what a scammers might require to gain his chances over you.