Unfortunately the increase in scammers is inevitable with the growth in the hobby the past 5-6 years. Fortunately I have not been a victim on any of my transactions on this website, usually through ebay, but as someone mentioned earlier ebay is the middlemen.
As much as it sucks for Jeremy, hopefully this is an isolated incident on Hobby Insider but good on Jeremy for using his social media outputs to put the awareness out there so that people have the information on what they can do to help prevent these types of things from happening to them. It there a fool proof solution that everyone will be happy with? Most likely not, the best we can do is take some measures to mitigate these types of things.