Yes I got scammed out of around 60 dollars worth of Bitcoin. Never send first even if you have done several trades with the person.
How did you loose it? Did you get scammed on this forum or somewhere else? As even there are many escrows who are turning out to be scam so its not worth to trust anyone.
I'm guessing it may possibly be from ponzi schemes. It's a shame that much has been gone to where it shouldn't have been.
I too have lost coins. Although I willingly let myself lose as I was just having fun testing out a lot of casino games and I think it was worth it since I actually had fun.