I'm sorry, but this is ridiculous. You offered .5 BTC for someone to provide a service to you, they provided the service, and you are trying to send .05 BTC.
You claim you made a typo. But you were not upfront about this. You were not honest about this. Instead you MODIFIED a post in which you were quoted, without noting the change, to say ".05 BTC." That is extremely shady.
Let's say you did make a typo... you're still obligated because that is the amount you agreed to pay. If the person on the other end of the transaction decided to be understanding of you allegedly "making a typo," then that would be okay. But they haven't. And you haven't spoken to them. Because you seem to think you can say one thing and do another.
That is not how respectable people operate.
For those saying this does not fit the definition of a scam... the definition "a dishonest scheme; a fraud." The definition of fraud: "wrongful or criminal deception intended to result in financial or personal gain."
I think it is quite deceptive to act like you said something you didn't, and even try to tamper with the evidence (the quoted post) to make it look like you said something else.
That's messed up man. And I think you know you're in the wrong here. You just don't want to be out the money. So man up and talk it over to sitnicki. Maybe he'll be understanding.
John
+1