I got ripped off by a BYOAC member here around 8 months ago. It was my fault, I offered to be a nice bloke and due to my trusting nature I left the door open inviting him to ream me, which he did.
The experience has left me twisted and sour so in reality not much has really changed, but a valuable lesson was learned; Trust nobody.....the saddest realisation of all. 
What happened?
A dude was in the main forum boasting about his recent Ebay win. I knew the place he had purchased the part from and I PM'd him advising I was going there myself in the next day to look for some parts. If he wanted, I advised, I would pick the part up for him while I was there and promptly dispatch it to him free of charge. He accepted. I picked up the item and paid the seller from my own wallet and sent it off.
The box I picked up was wrapped poorly so I put this package into another box and wrapped it all up. The guy rang me the next day to thank me and also comment that if I hadn't re-wrapped the part the original packaging would not have survived the journey. I said it was my pleasure and gave him my details to forward payment.
He said as way of thanks, if I sent him some discs he would burn some errr.. some mame related files so I purchased $50 worth of CD's and mailed them to him.(He didn't have a DVD burner.)
Long story short, it took me 4 months to get my $60 for the arcade part and the discs were never seen again. He stopped answering my emails months & months ago and his user status here has not been active since this event.
Somehow I imagined that both sharing a similar hobby and both being Aussies he could be trusted. This was my mistake and as I said, I invited the reaming not through lack of intelligence or being naive, I just thought the best of him and his intentions. OK... perhaps I was naive or just plain stupid.
But ahhhh... I have not been left completely sour, I gave a bum $20 a couple of weeks ago for some shoes because his feet looked cold so I still go out of may way to perform random acts of kindness for strangers.