I had a scam experience on the HMEM website when I was looking for some drawings and this is the message I got from someone with the member name purcelldominic:
Check with @The_Paso_Kid specializes in homemodelenginemachinist stuff, and haven't seen him here in a while. He has the drawings for sale. Here is email: trekkiepropstore3@gmail.com. Contact him to know if it's still available.
I contacted the email and they sent my a sample of the drawings and then was asked for the cash before sending ........I'm guessing you can work out what happened from here

That was not the end of the story, they came back and asked if I'd sent the money which I had and then asked for a screenshot from my bank account to verify that I had sent it.
I may look dumb, but I'm really not that dumb ...........

Anyway I was fortunate as the my bank refunded the money entirely and all I lost was a bit of pride, but I've done that on more than one occasion!
Caveat emptor!