I read lot of story of users got scammed. Despite several warning and negative feedback to scammer ,still user got scammed.

I like to know what assumption/stupidity did you did, that  get you  scammed.

For ex below are the assumption:
1. Nobody is here to scam.
2. User must be speaking truth so I should believe him.

For ex below are the stupidity:
1. I can send first to a newbie without escrow.


Sometimes there is complexity.

1. User urged it is very limited time deal (like an hour) so you are not able check facts/use escrow and get duped.


So how you get duped? I will like to learn reasons from you.